Dementia prevention, intervention, and care: 2020 report of the Lancet Commission

In an 8-year follow-up study of 599 volunteers, cognitively normal PET amyloid-positive people had an elevated risk of developing Alzheimer's disease compared with amyloid-negative people (17·7% vs 8·1%; OR 2·4, 95% CI 1·5-4·0).

“an 8-year follow-up study of 599 volunteers (average age 70 years) in Australia found that cognitively normal PET amyloid-positive people had an elevated risk of developing Alzheimer's disease compared with amyloid negative (17·7% vs 8·1%; OR 2·4, 95% CI 1·5–4·0).184”

• cites [184] sourceDisputed

  The Methods (Participants; page unavailable) describe 41 participants enrolled in the United States, not 599 volunteers in Australia. The Discussion (page unavailable) says longitudinal follow-up is still needed; the paper does not report an eight-year risk comparison or the quoted percentages and odds ratio. (LLM, conf=0.90)

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The first trial of population screening in the USA, screening 4005 primary care patients aged 65 years or older, found no clear benefit or harm in terms of quality of life, mood, or increasing diagnostic rates.

“The first trial of population screening took place in the USA, screening 4005 primary care patients aged 65 years or older. No clear benefit or harm in terms of quality of life, mood, or increasing diagnostic rates was found.197”

• cites [197] sourceDisputed

  The Methods (Patient Population; page unavailable) describe a drug trial enrolling people aged 55–85 who already met criteria for probable Alzheimer’s dementia, not population screening of primary-care patients aged 65 or older. The Results (Patient Characteristics; page unavailable) report 1,958 patients assigned to verubecestat or placebo, rather than 4,005 patients screened. The reported screening outcomes are not addressed in these passages. (LLM, conf=0.90)

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A study in care homes observed that engagement increased during activities in those who attended the groups.

“A study in care homes observed engagement increased during activities in those who attended the groups.228”

• cites [228] sourceDisputed

  The Intervention and delivery section describes individual therapy for family carers, not group activities in care homes. The Primary outcome section reports carers’ anxiety and depressive symptoms; it does not report increased engagement during activities. (LLM, conf=0.86)

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Around 70-80% of people diagnosed with dementia in primary care have at least two other chronic illnesses.

“Around 70–80% of people diagnosed with dementia in primary care have at least two other chronic illnesses.242, 243”

• cites [242] sourcePartly supported

  The Background says comorbid conditions are common among people with dementia. However, the Results report prevalence of at least one of three selected conditions in community-dwelling adults aged 75 or older, not the proportion of primary-care patients with at least two other chronic illnesses. The paper does not substantiate the claimed 70–80% figure. (LLM, conf=0.86)

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• cites [243] sourceDisputed

  The Results report 67 participants with two or more diseases in the entire cohort of 989, which included 310 people with dementia. Even if all 67 had dementia, that would be at most 22% of the dementia group—not 70–80%. The study describes a population-based cohort, not people diagnosed in primary care. (LLM, conf=0.88)

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A systematic review of RCTs without meta-analysis concluded that all interventions which had improved functioning in people living with dementia in the community have been individual rather than group interventions.

“A systematic review236 of RCTs without meta-analysis for overall effect size, concluded that all interventions which had improved functioning in people living with dementia in the community have been individual rather than group interventions.”

• cites [236] sourceDisputed

  The Method section (page unavailable) explicitly describes a scoping review of dementia education programmes and says that a formal systematic review would have yielded a null set. The Results section reports programmes for students, not RCTs assessing whether individual or group interventions improve functioning in people with dementia. The paper therefore contradicts the claim that it is the systematic review of RCTs described here; it does not address the claimed individual-versus-group finding. (LLM, conf=0.85)

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A systematic review and meta-analysis including 34 studies of 277,432 people with dementia found that in the six studies comparing groups, people with dementia had increased hospital admissions compared with those without dementia, after adjusting for age, sex, and physical comorbidity (RR 1.4, 95% CI 1.2-1.7).

“A systematic review and meta-analysis including 34 studies of 277 432 people with dementia found that in the six studies which compared the two groups, people with dementia had increased hospital admissions compared with those without dementia, after adjusting for age, sex, and physical comorbidity (RR 1·4, 95% CI 1·2–1·7; figure 9 ).271”

• cites [271] sourceDisputed

  Split into 2 atoms — 0 confirmed, 0 partially supported, 1 disputed, 0 misattributed, 1 unverifiable. Expand the claim to see per-atom verdicts.

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No evidence for medication efficacy, including cholinesterase inhibitors, antipsychotic medication, or melatonin, exists.

“However, no evidence for medication efficacy, including cholinesterase inhibitors, antipsychotic medication, or melatonin exists.287, 288, 289”

• cites [287] sourceSupported
• cites [288] sourceSupported
• cites [289] sourceDisputed

  The Characteristics of excluded studies section reports that haloperidol and chlorpromazine improved delirium in hospitalized AIDS patients, contrary to the claim that no evidence of antipsychotic medication efficacy exists. This review focuses on benzodiazepines; the cited passages do not assess cholinesterase inhibitors or melatonin. Page numbers were not available in our copy. (LLM, conf=0.85)

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One RCT testing decision-aids about families' and doctors' goals of care for people with advanced dementia led to increased palliative care content in care plans.

“One RCT testing decision-aids about families' and doctors' goals of care for people with advanced dementia led to increased palliative care content in care plans.305, 306”

• cites [305] sourceDisputed

  The Study design section (page unavailable) explicitly describes a longitudinal cohort study using questionnaires and interviews, not a randomized trial of decision aids. The Results section on end-of-life planning (page unavailable) describes carers’ experiences but does not report increased palliative-care content in care plans. (LLM, conf=0.86)

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• cites [306] sourcePartly supported

  The Methods describe a cluster RCT involving people with advanced dementia, but its intervention was facilitated family case conferencing and staff training, not decision aids. The Methods > Data collection lists end-of-life care and treatment outcomes, while the Discussion says adherence to care plans was not captured; the paper does not report increased palliative care content in care plans. (LLM, conf=0.88)

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In many high-income countries such as the USA, the UK, and France, age-specific dementia incidence rates are lower in more recent cohorts than in earlier cohorts collected using similar methods and target populations.

“However, in many HIC such as the USA, the UK, and France, age-specific incidence rates are lower in more recent cohorts compared with cohorts from previous decades collected using similar methods and target populations5”

• cites [5] sourceSupported

Higher HDL cholesterol might protect against vascular risk and inflammation accompanying amyloid-β pathology in mild cognitive impairment.

“Higher HDL cholesterol might protect against vascular risk and inflammation accompanying amyloid-β (Aβ) pathology in mild cognitive impairment.26”

• cites [26] sourcePartly supported

  The Discussion reports that neuroinflammation accompanies amyloid-β in a majority of amyloid-positive mild cognitive impairment cases. It does not support the claim that higher HDL cholesterol protects against that inflammation or vascular risk; searches for HDL, cholesterol, and vascular risk found no such finding in our copy. The supplied Discussion passage has no page number. (LLM, conf=0.88)

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People in otherwise good physical health can sustain a higher burden of neuropathology without cognitive impairment.

“People in otherwise good physical health can sustain a higher burden of neuropathology without cognitive impairment.22”

• cites [22] sourcePartly supported

  The Results report people with a high burden of Alzheimer’s disease pathology who had not been diagnosed with dementia, and the Discussion says people with lower frailty were better able to tolerate that pathology. The claim is broader: the study assessed Alzheimer’s pathology and dementia status, not neuropathology generally or the absence of all cognitive impairment. (LLM, conf=0.86)

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The higher social contact observed in the three low-income and middle-income regions provides potential insights for high-income countries on how to influence this dementia risk factor.

“The higher social contact observed in the three LMIC regions provides potential insights for HIC on how to influence this risk factor for dementia.30”

• cites [30] sourceCould not verify

  The Discussion (page unavailable) considers geographical differences in dementia prevalence and possible influences such as education, smoking, diet and living conditions. Searches for social contact and social isolation found no passage reporting higher social contact in the three regions or suggesting that it could guide high-income countries in addressing this risk factor. (LLM, conf=0.76)

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Increasing obesity and diabetes and declining physical activity in high-income countries might reverse the decline in dementia incidence.

“However, in these countries increasing obesity and diabetes and declining physical activity might reverse this trajectory.8, 9”

• cites [8] sourceNot checked — no full text of the source
• cites [9] sourcePartly supported

  The Discussion (page unavailable in our copy) says the continuing obesity epidemic may affect future dementia incidence, supporting the obesity part of the claim. It does not address rising diabetes or declining physical activity as reasons the decline in dementia incidence might reverse. (LLM, conf=0.88)

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Air pollution might act through vascular mechanisms.

“Similarly air pollution might act via vascular mechanisms.24”

• cites [24] sourceSupported
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A cross-sectional study found hearing loss was only associated with worse cognition in those not using hearing aids.

“Similarly, a cross–sectional study found hearing loss was only associated with worse cognition in those not using hearing aids.62”

• cites [62] sourceSupported
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A subsequent meta-analysis using the same three prospective studies measuring hearing by audiometry at baseline found an increased risk of dementia (OR 1.3, 95% CI 1.0-1.6) per 10 dB of worsening hearing loss.

“A subsequent meta-analysis using the same three prospective studies measuring hearing using audiometry at baseline, found an increased risk of dementia (OR 1·3, 95% CI 1·0–1·6) per 10 dB of worsening of hearing loss.58”

• cites [58] sourcePartly supported

  The Results (‘Characteristics and Quality of Included Studies’; ‘Hearing Loss and Dementia’, page unavailable) identify three cohort dementia studies and report a pooled OR of 1.28 (95% CI, 1.02–1.59), consistent with the claim’s rounded figures. The Methods require pure-tone audiometry, but our copy does not specify that this pooled OR represents risk per 10 dB of worsening hearing loss. (LLM, conf=0.86)

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In a cohort of 3433 people retiring at a mean age of 61 years, verbal memory declined 38% (95% CI 22-60) faster than before retirement.

“Similarly, in a cohort of 3433 people retiring at a mean age of 61 years, verbal memory declined 38% (95% CI 22–60) faster than before retirement.44”

• cites [44] sourcePartly supported

  The Results report 3,433 participants with an average retirement age of 61.2 years, and a 38% faster decline in verbal memory after retirement than before. Table 2 gives a 95% confidence interval for the change in slope, but our copy does not report the claimed 95% CI of 22–60% for the percentage change. (LLM, conf=0.88)

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In countries with younger compared with higher retirement ages, average cognitive performance drops more.

“In countries with younger compared to higher retirement ages, average cognitive performance drops more.49”

• cites [49] sourceSupported

One systematic review of retirement and cognitive decline found conflicting evidence.

“One systematic review of retirement and cognitive decline found conflicting evidence.45”

• cites [45] sourceSupported

A meta-analysis of 30 trials of computerised, therapy-based, and multimodal interventions for mild cognitive impairment found an effect on activities of daily living (d=0.23) and metacognitive outcomes (d=0.30) compared with control.

“A meta-analysis of 30 trials of computerised, therapy-based and multimodal interventions for mild cognitive impairment found an effect on activities of daily living (d=0·23) and metacognitive outcomes (d=0·30) compared to control.56”

• cites [56] sourceSupported

In a large study in China, people older than 65 years who read, played games, or bet more frequently had reduced dementia risk (n=15,882, OR=0.7, 95% CI 0.6-0.8).

“It found people older than 65 years who read, played games, or bet more frequently had reduced risk of dementia (n=15 882, odds ratio [OR]=0·7, 95% CI 0·6–0·8).”

• cites [40] sourcePartly supported

  The Abstract reports that intellectual activities, including reading, games and betting on horse racing, were associated with lower incident dementia odds (OR 0.71, 95% CI 0.60–0.84), consistent with the rounded figures cited. But the Key Points and Incidence of Dementia sections give a sample of 15,582, not 15,882; the reported OR is for participation in intellectual activities, not specifically for doing them more frequently. (LLM, conf=0.91)

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In 205 people aged 30-64 years followed up until 66-88 years, travel, social outings, playing music, art, physical activity, reading, and speaking a second language were associated with maintaining cognition, independent of education, occupation, late-life activities, and current structural brain health.

“so for example, in 205 people aged 30–64 years, followed up until 66–88 years, travel, social outings, playing music, art, physical activity, reading, and speaking a second language, were associated with maintaining cognition, independent of education, occupation, late-life activities, and current structural brain health.41”

• cites [41] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

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A study of 178,779 veterans with TBI with propensity-matched veterans without TBI found dementia risk was associated with TBI severity (HR 2.4, 95% CI 2.1-2.7 for mild TBI without loss of consciousness; 2.5, 2.3-2.8 for mild TBI with loss of consciousness; and 3.8, 3.6-3.9 for moderate to severe TBI).

“A study of 178 779 veterans with TBI with propensity-matched veterans without TBI found dementia risk was associated with TBI severity (HR 2·4, 95% CI 2·1–2·7 for mild TBI without loss of consciousness; 2·5, 2·3–2·8 for mild TBI with loss of consciousness; and 3·8, 3·6–3·9 for moderate to severe TBI).70”

• cites [70] sourceSupported

Women veterans with TBI had increased risk of dementia compared with those without TBI (1.5, 1.0-2.2).

“Similarly women veterans with TBI had increased risk of dementia compared to those without TBI (1·5, 1·0–2·2). 71”

• cites [71] sourceSupported

In the only randomised controlled trial of behavioural activation (221 people) for cognition in amnestic mild cognitive impairment, behavioural activation versus supportive therapy was associated with a decreased 2-year incidence of memory decline (RR 0.12, 0.02-0.74).

“In the only randomised controlled trial (RCT) of behavioural activation (221 people) for cognition in amnestic mild cognitive impairment, behavioural activation versus supportive therapy was associated with a decreased 2-year incidence of memory decline (relative risk [RR] 0·12, 0·02–0·74).57”

• cites [57] sourcePartly supported

  Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

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Those retiring because of ill health had lower verbal memory and fluency scores than those retiring for other reasons.

“Those retiring because of ill health had lower verbal memory and fluency scores than those retiring for other reasons.47”

• cites [47] sourcePartly supported

  The Results and Discussion report lower word recall (verbal memory) and verbal fluency scores among people who retired for health reasons. However, the Results explicitly compare verbal fluency with people who remained working, not with people who retired for other reasons; the claimed comparator is not established. (LLM, conf=0.85)

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Dementia risk increased with the duration and severity of diabetes.

“The risk of dementia increased with the duration and severity of diabetes.”

• cites [98] sourcePartly supported

  The Results report higher dementia risk in people with diabetes than in those without it. But the Conclusions explicitly state that the analysis did not examine diabetes duration or glycemic control, so it does not support the claimed increase with duration or severity. (LLM, conf=0.88)

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Meta-regression showed that dementia risk was lowered more when the achieved systolic pressure difference between intervention and control groups was larger.

“Meta-regression showed risk lowered more if the achieved systolic pressure differential was larger between the intervention and control group.”

• cites [81] sourcePartly supported

  The main text reports a meta-regression point estimate of lower dementia risk with each additional mm Hg of achieved systolic-pressure difference between groups. But it cautions that the analysis had few data points, and the confidence interval (−0.026 to 0.007) includes no reduction; the claim presents the trend more definitively than the source does. (LLM, conf=0.83)

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Persistent hypertension in midlife is linked to a higher risk of dementia in later life.

“Persistent midlife hypertension is associated with increased risk of a late life dementia.”

• cites [12] sourceSupported

In the same cohort, dementia risk rose further when hypertension continued into later life (HR 2.0, 95% CI 1.3-3.1).

“In this study risk increased further if hypertension persisted into later life (mean age 69 years; HR 2·0, 95% CI 1·3–3·1).”

• cites [12] sourceSupported

In SPRINT MIND, intensive compared with standard blood pressure treatment was associated with fewer dementia cases per 1000 person-years (HR 0.8, 95% CI 0.7-1.0).

“In the intensive compared with the standard treatment group, there were 7·2 dementia cases as opposed to 8·6 cases/1000 person-years (HR 0·8; 95% CI 0·7–1·0) within on average 2 years from the end of the intervention period and 5 years after baseline.”

• cites [79] sourceSupported

A 44-year Swedish study found that high baseline peak fitness was associated with lower dementia incidence than medium fitness.

“one 44-year study recruited 191 women (mean age 50) purposively to be representative of the Swedish population and reported that 32% of the participants with low baseline peak fitness, 25% with medium, and 5% with high fitness developed dementia (high vs medium HR 0·1, 95% CI 0·03–0·5, low vs medium 1·4, 0·7–2·8).”

• cites [90] sourceSupported

In the same cohort, late-midlife people with ideal cardiovascular parameters had lower 10-year risk of all-cause dementia, vascular dementia, and clinically diagnosed Alzheimer's disease than people with at least one risk factor.

“Those with ideal cardiovascular parameters had a lower 10-year risk of all-cause dementia (HR 0·8, 95% CI 0·1–1·0), vascular dementia (0·5, 0·3–0·8) and clinically diagnosed Alzheimer's disease (0·8, 0·6–1·0).”

• cites [75] sourcePartly supported

  The Results (‘Ideal-CVH and the 10-year risk of stroke and dementia’; page unavailable) associate higher remote, midlife Ideal-CVH scores with lower 10-year risks of all-cause dementia, vascular dementia, and clinically apparent Alzheimer’s disease. The Methods (‘Primary exposure’; page unavailable) define Ideal-CVH as a seven-point score, so the reported hazard ratios do not compare people with all ideal parameters against people with at least one risk factor. The Abstract Results also give the all-cause dementia HR of 0.80 a 95% CI of 0.67–0.97, not 0.1–1.0. (LLM, conf=0.90)

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Persistent systolic blood pressure of at least 130 mm Hg from mean age 45 to 61 was associated with increased dementia risk even in people free of cardiovascular disease.

“In those with persistent systolic blood pressure of 130 mm Hg or higher, from mean age 45 to 61 years, dementia risk is increased even if free of cardiovascular disease relative to those without hypertension (1·3, 1·0–1·7).”

• cites [13] sourcePartly supported

  The Results (Table 3) associate longer exposure to systolic blood pressure ≥130 mm Hg between mean ages 45 and 61 with dementia (HR 1.29, 95% CI 1.00–1.66), matching the cited estimate. The separate Results section on cardiovascular disease finds increased dementia risk among people free of CVD, but that analysis uses blood pressure at age 50, not persistent exposure from ages 45 to 61. The sentence combines these distinct findings as though the persistent-exposure estimate applied specifically to people free of CVD. (LLM, conf=0.90)

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The first meta-analysis of any blood-pressure-lowering drug RCTs reported about a 10% reduction in dementia risk at marginal significance (RR 0.9, 95% CI 0.9-1.0).

“The first included randomised controlled trials (RCTs) of any drug to lower blood pressure and reported a reduction in risk of around 10% at marginal significance (RR 0·9, 95% CI 0·9–1·0).”

• cites [81] sourcePartly supported

  The main text (page not provided) reports a random-effects meta-analysis of blood-pressure-lowering RCTs with RR 0.93, 95% CI 0.86–1.00, and p = 0.07, consistent with the claim’s rounded estimate and marginal significance. It does not establish that this was the first meta-analysis or specify that its inclusion criterion was any blood-pressure-lowering drug. (LLM, conf=0.84)

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In SPRINT MIND, intensive blood pressure treatment reduced pre-specified secondary outcomes of mild cognitive impairment and combined mild cognitive impairment or dementia.

“Pre-specified secondary outcomes were also reduced in the intensive arm for mild cognitive impairment (14·6 vs 18·3 cases/1000 person-years; HR 0·8, 95% CI 0·7–1·0), combined mild cognitive impairment or dementia (20·2 vs 24·1 cases/1000 person-years; HR 0·9, 95% CI 0·7–1·0)”

• cites [79] sourceSupported

The effect of different diabetic medications on cognition or dementia outcomes remains unclear.

“The effect of different diabetic medications on cognition or dementia outcomes remains unclear as few studies have investigated this area.”

• cites [99] sourceSupported

A pooled meta-analysis of type 2 diabetes found diabetes associated with increased risk of any dementia (RR 1.6 for women and men).

“In a pooled meta-analysis from over 2·3 million individuals with type 2 diabetes across 14 cohort studies, including 102 174 with dementia, diabetes was associated with an increased risk of any dementia (RR 1·6, 95% CI 1·5–1·8 for women and 1·6, 1·4–1·8 for men).”

• cites [98] sourcePartly supported

  The Abstract Results report 14 studies, 2,310,330 participants, 102,174 dementia cases, and an approximately 1.6-fold risk of any dementia in both sexes, with confidence intervals matching the citing sentence when rounded. But the citing sentence describes all 2.3 million participants as having type 2 diabetes; Table 1 lists participants with diabetes separately from total participants, so that population description is incorrect. (LLM, conf=0.88)

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One RCT found that 100 mg aspirin versus placebo in healthy adults older than 65 did not reduce dementia, death, physical disability, or cardiovascular disease over 4.7 years.

“One RCT found 100 mg aspirin versus placebo in 19 114 healthy adults older than 65 years did not reduce dementia (HR 1·0, 95% CI 0·8–1·2), death, physical disability, or cardiovascular disease over a period of 4·7 years.”

• cites [87] sourcePartly supported

  The Abstract (Methods and Results; page unavailable) supports the 100 mg aspirin–placebo comparison, 19,114 participants, median 4.7-year follow-up, and no substantial reduction in dementia, death, or persistent physical disability. The Methods (Trial End Points; page unavailable) says cardiovascular disease was a secondary outcome analyzed in an accompanying article, not reported as a result in this paper. The age description is also broader than the eligibility criteria: participants were generally at least 70, with a threshold of 65 for Black and Hispanic participants in the United States. (LLM, conf=0.88)

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In the Framingham Offspring cohort, midlife systolic blood pressure of at least 140 mm Hg was associated with increased dementia risk over 18 years (HR 1.6, 95% CI 1.1-2.4).

“In the Framingham Offspring cohort comprising 1440 people, elevated systolic blood pressure (≥140 mm Hg in midlife; mean age 55 years) was associated with an increased risk of developing dementia (HR 1·6, 95% CI 1·1–2·4) over an 18 year follow-up period.”

• cites [12] sourcePartly supported

  The Abstract and Results (p. 2449) support the cohort size, mean midlife age, systolic threshold, and dementia association: HR 1.57 (95% CI 1.05–2.35), which rounds to the cited figures. But the Abstract identifies 18 years as the blood-pressure exposure period, followed by a mean of 8 years of dementia follow-up; the claim incorrectly calls 18 years the follow-up period. (LLM, conf=0.92)

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The SPRINT trial was stopped early because intensive blood pressure treatment produced significantly fewer cardiovascular events and deaths than standard treatment.

“The US and Puerto Rico Systolic Blood Pressure Intervention Trial (SPRINT) in 9361 hypertensive adults aged 50 years and older, was stopped early because of significantly fewer cardiovascular events and deaths occurring in the intensive treatment arm (aiming for systolic <120 mm Hg, n=4678) in comparison with standard treatment (systolic <140 mm Hg, n=4683).”

• cites [78] sourcePartly supported

  The Methods (Statistical Analysis) say the SPRINT intervention was stopped on August 20, 2015, and the Results (Clinical Outcomes) report significantly fewer cardiovascular composite events and deaths with intensive treatment. But this paper reports those outcomes for 2,636 participants aged 75 or older, not the cited sentence’s full trial of 9,361 adults aged 50 or older, and it does not explicitly say the outcome differences were the reason for stopping. (LLM, conf=0.85)

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In a UK cohort of 8639 civil servants, systolic blood pressure of at least 130 mm Hg at age 50, but not at age 60 or 70, was associated with increased dementia risk.

“In a UK cohort study of 8639 civil servants, a single measure of systolic blood pressure of 130 mm Hg or higher at age 50 years but not at age 60 or 70 years was associated with increased risk of dementia (1·4, 1·1–1·7).”

• cites [13] sourceSupported

Exercise might need to be sustained and continue nearer the time of risk.

“As with other outcomes, exercise might be required to be sustained and continue nearer the time of risk.”

• cites [92] sourceSupported

In the same meta-analysis, no difference in dementia risk measured 10-15 years before incidence was found except in people with comorbid cardio-metabolic disease.

“Notably, however, no difference in dementia risk measured 10–15 years before time of dementia incidence was found except in those with comorbid cardio-metabolic disease (RR 1·3, 95% CI 0·8–2·1).”

• cites [91] sourcePartly supported

  The Results section, “Association of physical inactivity with dementia in relation to cardiometabolic disease,” reports no association when dementia was not preceded by cardiometabolic disease and an estimated hazard ratio of 1.30 (95% CI 0.79–2.14) when it was. But the latter estimate was imprecise, its confidence interval includes no difference, and the difference between groups was not statistically significant. Thus the source does not establish the cardiometabolic group as an exception; it also assesses activity at least 10 years before dementia onset, not specifically 10–15 years before. (LLM, conf=0.90)

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The attributable burden of dementia and excess death from PM2.5 was particularly high in Black or African American individuals and socio-economically disadvantaged communities.

“The attributable burden of dementia and excess death from PM2·5 in one large 10-year US study was particularly high in Black or African American individuals and socio-economically disadvantaged communities and related to particulate PM2·5 concentrations above the US guidelines.”

• cites [130] sourcePartly supported

  The Abstract reports PM2.5-attributable dementia deaths, while the Discussion reports a disproportionate overall mortality burden among Black individuals and socioeconomically disadvantaged communities. The paper does not establish that the dementia-specific burden was particularly high in those groups. The full citing sentence also says the burden was related to concentrations above US guidelines, whereas the Abstract and Conclusions say nearly all attributable deaths were associated with concentrations below EPA standards. (LLM, conf=0.88)

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A systematic review of 13 longitudinal studies found exposure to PM2.5, NO2, and carbon monoxide associated with increased dementia risk.

“A systematic review of studies until 2018 including 13 longitudinal studies with 1–15 years follow-up of air pollutants exposure and incident dementia, found exposure to PM2·5, NO2, and carbon monoxide were all associated with increased dementia risk.”

• cites [24] sourceSupported

A systematic review and meta-analysis of 51 cohort studies found high social contact associated with better late-life cognitive function.

“High social contact (measured through either or both of social activity and social network) was associated with better late-life cognitive function (r=0·05, 95% CI: 0·04–0·065) and no differences according to sex or length of time followed up.”

• cites [121] sourceSupported

Stopping smoking, even when older, reduces dementia risk.

“Stopping smoking, even when older, reduces this risk.”

• cites [113] sourcePartly supported

  The Results report lower dementia risk among long-term quitters than continual smokers, and the Abstract Methods specify that participants were men aged 60 or older. But the Abstract Interpretation says prolonged quitting *may* reduce risk; the claim presents the reduction as certain and does not distinguish long-term from recent quitting. Page numbers are unavailable in our copy. (LLM, conf=0.86)

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Meta-regression found a non-significant trend for the depression-dementia association to be weaker with longer follow-up.

“Meta-regression analysis revealed a non-significant trend for the association between depression and incident dementia to be weaker when the length of follow-up was longer.”

• cites [116]Supported

A systematic review of low-quality RCTs found that facilitated meeting and discussion groups were associated with improved global cognition and increased brain volume in older adults with normal cognition.

“a systematic review of low quality RCTs of 576 adults aged 60 or more years with normal cognition found facilitated meeting and discussion groups were associated with improved global cognition and increased brain volume at follow-up.”

• cites [118] sourcePartly supported

  The Results table (page not available) describes facilitated meeting and discussion groups in the Mortimer study and reports increased brain volume; the Discussion says social activity in the reviewed trials improved global cognition. However, the cited sentence’s 576 participants include Park’s 221-person non-RCT, so they were not all participants in RCTs. The copy also does not establish that the facilitated meeting groups specifically produced the global-cognition improvement or characterize the RCTs as low quality. (LLM, conf=0.88)

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A meta-analysis of 32 studies found that a depressive episode was a risk factor for dementia (pooled effect size 2.0, 95% CI 1.7-2.3).

“In a meta-analysis of 32 studies, with 62 598 participants, with follow-up from 2 to 17 years, a depressive episode was a risk factor for dementia (pooled effect size 2·0, 95% CI 1·7–2·3).”

• cites [116]Supported

Smokers are at higher risk of premature death before the age at which they might have developed dementia, introducing bias and uncertainty in the smoking-dementia association.

“Smokers are at higher risk of dementia than non-smokers,2 and at a higher risk of premature death before the age at which they might have developed dementia, introducing some bias and uncertainty in the association between smoking and risk of dementia.”

• cites [111] sourceSupported
• cites [112] sourceNot checked — no full text of the source

A UK Biobank study found that drinking more than 12 units per week was associated with slightly greater decline in reaction time than drinking less.

“The study reported that those who drank more than 12 units per week declined slightly more in reaction time in a perceptual matching task than those who drank less (β2=−0·07, 95% CI −0·09 to −0·04).”

• cites [106] sourcePartly supported

  The Results (Curvilinear modelling; page unavailable) report that reaction-time performance deteriorated as alcohol consumption increased beyond 10 g/day, supporting the general direction of the claim. The paper does not report a comparison at 12 units per week; its reaction-time nonlinear coefficient is β₂ = 0.035 (95% CI 0.007 to 0.059), not the quoted β₂ = −0.07 (95% CI −0.09 to −0.04). (LLM, conf=0.90)

  Experimental — accuracy not yet measured

A systematic review and meta-analysis found dementia risk elevated in lifelong single and widowed people compared with married people.

“A systematic review and meta-analysis including 812 047 people worldwide found dementia risk to be elevated in lifelong single (RR 1·4, 95% CI 1·1–1·9) and widowed people (1·2, 1·0–1·4), compared with married people and the association was consistent in different sociocultural settings.”

• cites [120] sourcePartly supported

  The Abstract Results report 15 studies with 812,047 participants and elevated dementia risk for lifelong single (RR 1.42, 95% CI 1.07–1.90) and widowed people (RR 1.20, 1.02–1.41) compared with married people, matching the cited estimates after rounding. The Results list studies from several countries, but our copy does not establish the citing sentence’s further claim that the association was consistent across sociocultural settings. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

Animal models suggest that airborne particulate pollutants accelerate neurodegenerative processes through cerebrovascular and cardiovascular disease, Aβ deposition, and amyloid precursor protein processing.

“Animal models suggest airborne particulate pollutants accelerate neurodegenerative processes through cerebrovascular and cardiovascular disease, Aβ deposition, and amyloid precursor protein processing.”

• cites [125] sourcePartly supported

  The Discussion (page unavailable) says animal and experimental studies link particulate and gaseous pollutants to pathways involved in dementia, and describes cardiovascular and cerebrovascular disease as a possible indirect route. It also says evidence for that indirect route remains elusive. The copy does not specifically support amyloid precursor protein processing as a pollutant-related mechanism, so the full list of mechanisms is not established by this source. (LLM, conf=0.82)

  Experimental — accuracy not yet measured
• cites [126] sourceNot checked — no full text of the source

Among 50,000 men older than 60, stopping smoking for more than 4 years compared with continuing substantially reduced dementia risk over the subsequent 8 years.

“Among 50 000 men aged older than 60 years, stopping smoking for more than 4 years, compared to continuing, substantially reduced dementia risk over the subsequent 8 years (HR 0·9; 95% CI 0·7–1·0).”

• cites [113] sourcePartly supported

  The Methods and Results describe 46,140 men aged 60 or older followed for eight years and report lower overall dementia risk among long-term quitters than continual smokers. The cited sentence approximates the cohort size and hazard ratio, but changes the quitting threshold from ≥4 years to more than 4 years and reports a 95% CI of 0.7–1.0 rather than 0.75–0.99. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

More frequent social contact during late middle age is associated with a modest reduction in dementia risk, independent of socio-economic and other lifestyle factors.

“This finding suggests more frequent social contact during late middle age is associated with a modest reduction in dementia risk, independent of socio-economic and other lifestyle factors.”

• cites [123] sourceSupported

A meta-analysis of individual-level data found that higher body mass measured before probable preclinical and prodromal dementia was associated with increased dementia risk.

“In a further meta-analysis of individual level data from 1·3 million adults (aged ≥18 years), which included two studies from the meta-analysis cited above,109 higher body mass measured before probable preclinical and prodromal dementia was associated with increased dementia risk (RR 1·3, 1·1–1·7/5-unit increase in BMI).”

• cites [11] sourcePartly supported

  The Discussion reports that higher BMI was associated with increased dementia risk when measured more than 20 years before diagnosis, consistent with measurement before probable preclinical dementia. However, the main Results give a hazard ratio of 1.16 (95% CI 1.05–1.27) per 5-unit BMI increase, not the cited 1.3 (1.1–1.7); a value of 1.33 appears in a five-study sensitivity analysis. Our copy does not establish the stated overlap with two studies in the earlier meta-analysis. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Drinking less than 21 units of alcohol per week might be associated with lower dementia risk.

“Drinking less than 21 units of alcohol per week (1 unit of alcohol=10 mL or 8 g pure alcohol) might be associated with a lower risk of dementia.”

• cites [105] sourcePartly supported

  The Discussion (page unavailable) reports a lower estimated dementia risk for 7.1–14.0 drinks per week versus less than 1 drink per week among older adults without mild cognitive impairment, but the confidence interval includes no difference. The paper does not establish a cutoff of 21 eight-gram units per week, and the association was not the same among participants with mild cognitive impairment. The claim therefore generalizes beyond the reported dose categories and population. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [106] sourcePartly supported

  The Discussion ('What this study adds'; page unavailable) links lower alcohol consumption with better cognitive performance, but recommends an upper limit of one UK unit per day, not 21 units per week. The paper's findings concern cognitive performance and decline, not measured dementia risk; its Introduction mentions possible dementia protection as a suggestion from earlier studies. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Antidepressant use did not decrease dementia risk.

“The use of antidepressants did not decrease this risk.”

• cites [118] sourceCould not verify

  The Results and Discussion passages concern social activity, social support, and cognitive functioning in older adults, not antidepressant use or dementia risk. Searches for antidepressants and depression-related dementia incidence found no passage addressing whether antidepressants decrease that risk. No page numbers were provided in our copy. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Drinking more than 14 units was associated with right-sided hippocampal atrophy on MRI.

“Drinking more than 14 units was also associated with right sided hippocampal atrophy on MRI.”

• cites [108] sourceSupported

Evidence exists for additive effects of different pollutants.

“although evidence for additive effects of different pollutants exists.”

• cites [127] sourcePartly supported

  The Methods (Statistical analysis; page unavailable) say the study included PM2.5 from wood burning and vehicle exhaust simultaneously in its models. The Discussion (page unavailable) reports associations with both sources and says they might be independent risk factors if the associations are causal. It does not establish that their effects are additive. (LLM, conf=0.82)

  Experimental — accuracy not yet measured
• cites [128] sourceCould not verify

  The Results report dementia risk in relation to NOx exposure, but do not assess additive effects of different pollutants. A search for “additive” found a Discussion passage about vascular lesions and cognition, not pollutants; searches for combined and synergistic pollutant effects found no supporting passage. Page numbers were unavailable in our copy. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [129] sourcePartly supported

  The Discussion (Context; page not available) reports that air pollution and night noise each showed associations with dementia, and cites earlier evidence that they might act synergistically. But in this study’s combined model, the noise association diminished and was of borderline statistical significance. The paper therefore does not establish additive effects of different pollutants. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

The protective effect of more social contact is largely consistent across different settings and for either sex.

“Despite clear cultural variation in the meaning and perception of social isolation, findings of protective effect of more social contact are largely consistent in different settings and for either sex across the studies and meta-analyses.”

• cites [118] sourcePartly supported

  The Conclusions report an association between social relationships and cognition in healthy older adults, supporting the general direction of the claim. But the Results do not establish that a protective effect is consistent across settings or sexes: a Japanese study found an association for women but not men, while a Taiwanese study found no association for its social-network measures and reported differing results for men and women. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [120] sourcePartly supported

  The Discussion reports lower dementia risk among married people across numerous countries and time periods, and the Results (Secondary analyses; page unavailable) report no sex difference in the marital-status association in two studies. The Introduction links marriage to more frequent social contact, but the paper does not establish that social contact itself has a protective effect consistently across settings and sexes. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [121] sourcePartly supported

  The Results (Effect of gender; page not supplied) report similar, small significant associations for men and women, and the Discussion describes a small association between social integration and better later-life cognitive function. The review includes cohorts from different countries, but the passages do not establish that the association is consistent across settings; they also report heterogeneity between studies. (LLM, conf=0.82)

  Experimental — accuracy not yet measured

A review of 19 longitudinal studies supports a relationship between increased BMI and dementia.

“New evidence supports the relationship between increased BMI and dementia from a review of 19 longitudinal studies including 589 649 people aged 35 to 65 years, followed up for up to 42 years.”

• cites [109] sourcePartly supported

  The Results (Included and excluded studies; page not provided) report 589,649 participants followed for up to 42 years, and the Discussion describes up to 19 cohort studies. The Discussion finds increased dementia risk with midlife obesity, but not with overweight, so the claim's broader reference to increased BMI overstates the finding. (LLM, conf=0.88)

  Experimental — accuracy not yet measured

A UK 28-year follow-up study found that more frequent social contact at age 60 was associated with lower dementia risk over 15 years.

“A UK 28-year follow-up study of 10 308 people found that more frequent social contact at age 60 years was associated with lower dementia risk over 15 years of follow-up (HR for one standard deviation social contact frequency 0·9, 95% CI 0·8–1·0).”

• cites [123] sourceSupported

A longitudinal cohort study found that the highest intake of green leafy vegetables was associated with less cognitive decline over 4.7 years than the lowest intake.

“One example is a longitudinal cohort study of 960 participants, ages 58–99 years, in which those reporting the highest intake of green leafy vegetables, equivalent to 1·3 servings per day, had less cognitive decline over 4·7 years than those reporting the lowest intake (β=0·05 standardised units 95% CI 0·02–0·07).”

• cites [146] sourceSupported
  Experimental — accuracy not yet measured

Vitamin E supplementation does not prevent progression from mild cognitive impairment to dementia.

“or with vitamin E in preventing progression from mild cognitive impairment to dementia.151”

• cites [151] sourcePartly supported

  The Authors’ conclusions say there is no evidence that alpha-tocopherol prevents progression from MCI to dementia. The “Vitamin E for mild cognitive impairment” section likewise reports no evidence of an effect over 36 months compared with placebo. That supports a lack of demonstrated benefit, but not the categorical claim that vitamin E does not prevent progression. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

The authors reported this difference as equivalent to being 11 years younger.

“The authors report this difference as being equivalent to being 11 years younger.”

• cites [146] sourceSupported

HATICE study found a small improvement in the cardiovascular risk composite primary outcome in the intervention group compared with control at 18 months, mainly through weight loss.

“A small improvement in the cardiovascular risk composite primary outcome was observed in the intervention group compared with the control group at 18 months, mainly through weight loss”

• cites [157] sourcePartly supported

  The Methods (Primary outcome; page unavailable) define a cardiovascular-risk composite assessed from baseline to 18 months. But this paper describes the trial’s planned analyses rather than reporting results; it does not support the claimed improvement versus control or the assertion that weight loss mainly drove it. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [158] sourceSupported

FINGER RCT found a small reduction in cognitive decline in the multidomain intervention group compared with control (Z score 0·02, 95% CI 0·00-0·04) regardless of baseline sociodemographic, socio-economic, cognitive, or cardiovascular status.

“FINGER found a small group reduction in cognitive decline in the intervention group compared with control (comprehensive neuropsychological test battery Z score 0·02, 95% Cl 0·00–0·04) regardless of baseline sociodemographic, socio-economic, cognitive, or cardiovascular status.155”

• cites [155] sourcePartly supported

  The Results (page unavailable) report a beneficial effect on the NTB total score and no significant variation in that effect by the listed baseline characteristics. Our copy does not report the claimed overall Z-score difference of 0.02 or its 95% CI of 0.00–0.04; it describes the main trial result as previously published. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

A 24-month multi-nutrient drink trial in 311 people with prodromal Alzheimer's disease found no significant effect on preventing cognitive deterioration.

“A 24-month RCT of 311 people of a multi-nutrient drink containing docosahexaenoic acid, vitamins B12, B6, folic acid, and other nutrients; found no significant effect on preventing cognitive deterioration in prodromal Alzheimer's disease.152”

• cites [152] sourcePartly supported

  The Abstract (Methods and Findings) describes a 24-month randomised trial in prodromal Alzheimer’s disease, with 311 participants assigned to a drink or control, and reports no significant effect on the primary cognitive endpoint. The Introduction lists the named nutrients. But the Results report significantly less worsening on a secondary cognitive-functional measure, CDR-SB, so the unqualified claim of no significant effect on cognitive deterioration overstates the findings; the Discussion also says the primary endpoint was inadequately powered. (LLM, conf=0.88)

  Experimental — accuracy not yet measured

Diet might influence dementia risk by protecting against the excess risk of cardiovascular risk factors.

“from dementia, except in those with cardiovascular disease, suggesting that diet might influence dementia risk by protecting from the excess risk of cardiovascular risk factors.147”

• cites [147] sourcePartly supported

  The Results (Post-hoc Sensitivity Analyses; page unavailable) report one exception to generally nonsignificant findings: a higher healthy-food score was associated with reduced dementia risk among people with a history of cardiovascular disease. The paper does not say that diet protects against excess risk from cardiovascular risk factors or establish that proposed mechanism. (LLM, conf=0.83)

  Experimental — accuracy not yet measured

Supplement use lacks evidence for preserving cognitive function or preventing dementia in middle-aged or older people.

“A systematic review and a Cochrane review including RCTs of supplements (A, B, C, D, and E; calcium, zinc, copper, and multivitamins trials, n-3 fatty acids, antioxidant vitamins, and herbs) found a lack of evidence for supplement use to preserve cognitive function or prevent dementia in middle-aged (45–64 years) or older people (aged 65 years and older).148, 149”

• cites [148] sourcePartly supported

  The Discussion says the reviewed trials did not provide compelling evidence for preserving memory in adults over 65, and none reported reduced progression toward MCI or dementia. This source does not establish the claim for middle-aged adults aged 45–64; its conclusion is limited to the elderly. Page numbers are not provided in our copy. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [149] sourceSupported

In HATICE, the dementia risk score was slightly lower in those who received the intervention (mean difference −0·15, 95% CI −0·3 to −0·0).

“and the dementia risk score was slightly lower in those who received the intervention (mean difference −0·15, 95% CI −0·3 to −0·0).”

• cites [157] sourceCould not verify

  The Methods > Secondary outcomes section lists the CAIDE dementia risk score as a planned outcome. The Statistical analyses > Data analysis section describes analyses to be performed, but our copy reports no intervention-group difference or 95% confidence interval for that score. Searches for the stated numbers and for CAIDE results found no such result; page numbers are unavailable in our copy. (LLM, conf=0.78)

  Experimental — accuracy not yet measured
• cites [158] sourceSupported

B vitamin supplementation for 6 to 24 months has no beneficial effect on cognition in people with mild cognitive impairment.

“Cochrane reviews found no evidence for beneficial effects on cognition of those with mild cognitive impairment of supplementation with B vitamins for 6 to 24 months150”

• cites [150] sourceSupported

Mediterranean diet improves global cognition compared with controls in people with normal cognition, based on meta-analysis of two RCTs with 471 participants (SMD 0·2, 95% CI 0·0-0·4).

“Meta-analysis of two RCTs with 471 participants with normal cognition found the Mediterranean diet improved global cognition compared to controls (SMD 0·2, 95% CI 0·0–0·4).153”

• cites [153] sourcePartly supported

  The RCT results (p. 13) report improved global cognition versus controls across two studies, with an effect of 0.19 (95% CI 0.003–0.39), consistent with the claim’s rounded estimate. But that analysis included 429 participants, not 471; the abstract (p. 1) gives 471 as the total across the included RCTs. (LLM, conf=0.90)

  Experimental — accuracy not yet measured

Sleep disturbances were associated with higher risk of all-cause dementia and clinically diagnosed Alzheimer's disease compared with no sleep disturbance.

“All these disturbances were associated with a higher risk of all-cause dementia (RR 1·2; 95% CI 1·1–1·3)137 and clinically diagnosed Alzheimer's disease (1·6, 1·3–1·9) compared with no sleep disturbance, although not all cohort studies excluded those with cognitive impairment or dementia at baseline from their analyses.”

• cites [137] sourceNot checked — no full text of the source
• cites [138] sourceSupported

In a subgroup analysis of FINGER, greater beneficial effects on processing speed were observed in individuals with higher baseline cortical thickness in Alzheimer's disease areas.

“However, in a subgroup analysis, greater beneficial effects were observed on processing speed in individuals with higher baseline cortical thickness in Alzheimer's disease areas.156”

• cites [156] sourceSupported

In a US study of 1671 randomly selected older people, the prevalence of PET-detected amyloid positivity increased from 2·7% (95% CI 0·5-4·9) in people without cognitive impairment aged 50-59 years to 41·3% (95% CI 33·4-49·2%) aged 80-89 years.

“The prevalence of PET detected amyloid positivity increased from 2·7% (95% CI 0·5–4·9) of people without cognitive impairment aged 50–59 years to 41·3% (95% CI 33·4–49·2%) aged 80–89 years.182”

• cites [182] sourceCould not verify

  The Study Population and Patients sections describe Medicare beneficiaries aged 65 or older with mild cognitive impairment or dementia, not a random sample of cognitively unimpaired people. I searched for the 1,671-person sample, the 50–59 and 80–89 age groups, and the reported 2.7% and 41.3% estimates; no passage in our copy reports them. Page numbers were not available in the indexed passages. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

In participants with mild cognitive impairment who were amyloid positive, the probability of developing Alzheimer's disease (HR 1·9, 95% CI 0·9-3·9) was not very different from those who were amyloid negative (HR 1·6, 95% CI 0·8-3·4).

“In participants with mild cognitive impairment who were amyloid positive the probability (HR 1·9, 95% CI 0·9–3·9) was not very different to those who were amyloid negative (1·6, 0·8–3·4).”

• cites [182] sourceCould not verify

  The Abstract and Statistical Analyses sections examine changes in diagnosis and clinical management after amyloid PET, not progression from mild cognitive impairment to Alzheimer disease. Searches for the stated hazard ratios and for longitudinal progression found no passage reporting either estimate or comparing the two groups’ progression risks. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

Population-derived studies show increases in plaques from less than 3% at age 50-59 years to around 40% at age 80-89 years.

“population derived studies show increases in plaques in the population from less than 3% at age 50–59 years to around 40% at age 80–89 years.182”

• cites [182] sourceCould not verify

  The Patients section reports amyloid PET positivity among Medicare beneficiaries with mild cognitive impairment or dementia, not plaque prevalence in a population-derived sample. Searches for the 50–59 and 80–89 age ranges and the stated percentages found no passage reporting those figures or the claimed age-related increase. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

At 5-year follow-up, amyloid-positive participants with normal cognition or mild cognitive impairment had the same pattern of increased risk compared with amyloid-negative people (2·6, 1·4-4·9).

“Follow-up at 5 years of amyloid-positive participants with normal cognition or mild cognitive impairment versus amyloid negative people found the same pattern of increased risk (2·6, 1·4–4·9).”

• cites [184] sourceCould not verify

  The Methods (Participants; page unavailable) describe amyloid-positive and amyloid-negative groups, but the paper does not report their relative risk at five years. The Discussion (page unavailable) says longitudinal follow-up is still needed. Searches for five-year follow-up and the reported risk estimate found no supporting passage. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

In 10-year follow-up, PET amyloid positivity was associated with a higher probability of developing Alzheimer's disease compared with amyloid negativity (HR 2·6, 95% CI 1·4-4·9).

“In 10-year follow-up PET positivity was associated with a higher probability of developing Alzheimer's disease compared with those who were amyloid negative (HR 2·6, 95% CI 1·4–4·9).”

• cites [182] sourceCould not verify

  The Abstract (page not available in our copy) reports changes in clinical management within 90 days, and the Statistical Analyses section describes analyses of management changes rather than 10-year Alzheimer disease incidence. Searches for 10-year follow-up, conversion to Alzheimer disease, and the stated hazard ratio found no passage supporting the claimed association or HR 2.6 (95% CI 1.4–4.9). (LLM, conf=0.76)

  Experimental — accuracy not yet measured

These results are similar to other amyloid blood biomarkers.

“These results are similar to other amyloid blood biomarkers189, 190”

• cites [189] sourceCould not verify

  The Discussion describes serum neurofilament light as a marker of neuronal damage in multiple sclerosis, but does not compare its results with amyloid blood biomarkers. Searches for amyloid blood biomarkers and amyloid-beta comparisons found no passage addressing that comparison in our copy; page numbers were not provided. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [190] sourceCould not verify

  The Introduction identifies plasma neurofilament light as a blood-based marker of neuronal injury, not an amyloid blood biomarker. The Results and Discussion compare it with CSF amyloid biomarkers and plasma tau, but do not address whether these results are similar to those for amyloid blood biomarkers (searched: plasma amyloid and blood amyloid biomarkers). (LLM, conf=0.73)

  Experimental — accuracy not yet measured

Effects on quality of life were only apparent for those people living with a carer.

“Effects on quality of life were only apparent for those people living with a carer.”

• cites [212] sourceCould not verify

  The Methods (Measures) describe family carers as relatives who visit care-home residents, not people living with them. The Results (Agitation levels and correlates) report an association between agitation and residents’ quality of life, but the paper does not assess whether an effect on quality of life was apparent only among people living with a carer. Searched for that living-arrangement comparison and for quality-of-life effects by carer status. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Three 5HT6 antagonists and the calcium channel blocker nilvadipine have also been ineffective.

“Three 5HT6 antagonists and the calcium channel blocker nilvadipine203, 204 have also been ineffective.”

• cites [203] sourceCould not verify

  The Results and Discussion address an exercise intervention for people with dementia, not trials of 5HT6 antagonists or nilvadipine. Searches for those drugs and for calcium-channel-blocker trials found no passage in our copy addressing their effectiveness; no page numbers were provided. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [204] sourceNot checked — no full text of the source

A model of lifetime risks for amyloid-positive people without other biomarkers estimates Alzheimer's disease risk at 8·4% for a 90-year-old woman, 23·5% for a 75-year-old woman, and 29·3% for a 65-year-old woman.

“A model of lifetime risks of people who are amyloid positive without any other biomarkers finds it to be 8·4% for a 90-year-old woman who is cognitively normal at baseline, 23·5% for a 75-year-old woman and 29·3% for a 65-year-old woman.185”

• cites [185] sourceCould not verify

  The Abstract describes a study of plasma amyloid biomarkers, and Materials and Methods (Study populations; page unavailable) describes its participant cohorts. Neither reports a lifetime-risk model or the age-specific estimates of 8.4%, 23.5%, and 29.3%; searches for the model and those figures found no supporting passage in our copy. (LLM, conf=0.75)

  Experimental — accuracy not yet measured

No direct evidence was observed indicating that cognitive training was superior to cognitive stimulation therapy.

“No direct evidence was observed to suggest that cognitive training was better than cognitive stimulation therapy.”

• cites [207] sourceCould not verify

  The Introduction and Results (pages unavailable) describe a trial comparing dementia care management with care as usual, not cognitive training with cognitive stimulation therapy. Searches for both therapies and a direct comparison found no passage addressing whether one was better than the other. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

The US Reducing Disability in Dementia study found increased physical activity, with days of taking 30 or more minutes of exercise showing an effect size of 0.6 (95% CI 0.4-0.8) after treatment and 0.3 (95% CI 0.1-0.5) at 13 months in a before-and-after comparison.

“The study found increased physical activity; days of taking 30 or more minutes of exercise (effect size 0·6, 95% CI 0·4–0·8 after the treatment and 0·3, 0·1–0·5 at 13 months) in a before and after intervention comparison.”

• cites [209] sourceCould not verify

  The Activities of daily living and Main results sections report antidepressant-versus-placebo outcomes, not exercise outcomes. Searches for “Reducing Disability in Dementia,” 30-minute exercise, and the stated effect sizes found no passage addressing the claimed before-and-after results at treatment completion or 13 months. Page numbers were not available in our copy. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

The TIME study led to reduced agitation at 8 weeks (NPI −1.1, 95% CI −0.1 to −2.1; CMAI −4.7, −0.6 to −8.8) and at 12 weeks (NPI −1.6, −0.6 to −2.7; CMAI −5.9, −1.7 to −10.1).

“This intervention led to reduced agitation at 8 weeks (NPI −1·1 points, 95% CI −0·1 to −2·1; CMAI −4·7 points, −0·6 to −8·8) and 12 weeks (NPI −1·6, −0·6 to −2·7; CMAI −5·9, −1·7 to −10·1).220”

• cites [220] sourceCould not verify

  The review’s Effects of interventions and Pooled studies sections discuss antipsychotic withdrawal, but do not report the TIME intervention or the quoted agitation effects at 8 and 12 weeks. Searches for “TIME study,” CMAI, and the stated effect estimates found no matching results in our copy. Page numbers were not provided for these passages. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Evidence for the effectiveness of non-pharmacological interventions for psychosis in dementia is weaker than for agitation.

“evidence for effectiveness of these interventions for psychosis in dementia is weaker than for agitation.224”

• cites [224] sourceCould not verify

  The 'Why it is important to do this review' section says behavioral interventions may benefit neuropsychiatric symptoms overall, but does not compare their effectiveness for psychosis and agitation. Searches for non-pharmacological interventions, psychosis, and agitation found no passage making the claimed comparison; the review focuses on pharmacological treatment of apathy. (LLM, conf=0.73)

  Experimental — accuracy not yet measured

Since the 2017 Commission, two new systematic reviews of antidepressants for depression in dementia reported moderate-quality evidence that antidepressant treatment does not lead to better control of symptomatology compared with placebo.

“Since the 2017 Commission two new systematic reviews of antidepressants to treat depression in dementia reported moderate quality evidence that antidepressant treatment for people with dementia does not lead to better control of symptomatology compared with placebo.214, 215”

• cites [214] sourceCould not verify

  The Introduction discusses a citalopram trial for agitation, not antidepressants for depression. The Discussion and References do not report two systematic reviews, rate their evidence as moderate quality, or compare antidepressants with placebo for depressive symptoms in dementia. Searched for antidepressant reviews, depression, and placebo comparisons. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [215] sourceNot checked — no full text of the source

There was low-quality evidence that, in general, discontinuation might make little or no difference to overall neuropsychiatric symptoms, adverse events, quality of life or cognitive function.

“There was low-quality evidence that, in general, discontinuation might make little or no difference to overall neuropsychiatric symptoms, adverse events, quality of life or cognitive function.226”

• cites [226] sourceCould not verify

  The Secondary outcomes sections compare a sleep intervention with treatment as usual; they do not assess discontinuation. The Discussion reports improved quality of life in the intervention group, but it cannot establish the claimed effects of discontinuation. Searches for the quoted claim and for medication discontinuation found no passage addressing it; page numbers were unavailable in our copy. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

Carer distress related to neuropsychiatric symptoms rather than dementia symptoms was associated in one study with increased use and costs of health services.

“Carer distress related to neuropsychiatric symptoms rather than the dementia symptoms was associated in one study with increased use and costs of health services,232”

• cites [232] sourceCould not verify

  The Discussion (page not available) examines predictors of hospitalization for falls and reports no independent association with neuropsychiatric symptoms in adjusted models. Our copy does not address whether carer distress is associated with health-service use or costs; searches for carer distress and caregiver burden with service utilization and costs found no relevant passage. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

A UK RCT of 14 sessions of cognitive rehabilitation focused on individual goal attainment found that the intervention group reported increased goal attainment over 3 and 9 months compared with usual treatment (effect size 0.8, 95% CI 0.6-1.0 at both time points).

“The intervention group reported increased goal attainment over 3 and 9 months compared with usual treatment (effect size 0·8, 95% CI 0·6–1·0 at both 3 and 9 months).235”

• cites [235] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 1 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured

Two new cluster RCTs of professionals delivering multicomponent, interdisciplinary interventions in care homes successfully reduced agitation.

“Two new cluster RCTs of professionals delivering multicomponent, interdisciplinary, interventions in care homes successfully reduced agitation.”

• cites [219] sourceNot checked — no full text of the source
• cites [220] sourceCould not verify

  The Study setting section reports nursing-home participants, but the Interventions section describes trials comparing antipsychotic withdrawal with continuation. Searches for cluster RCTs and multicomponent, interdisciplinary interventions found no passage reporting two such care-home trials or their effects on agitation. Page numbers were not available for these passages. (LLM, conf=0.73)

  Experimental — accuracy not yet measured

Non-completers had more severe neuropsychiatric symptoms.

“Non-completers had more severe neuropsychiatric symptoms.”

• cites [213] sourceCould not verify

  The Materials and methods (Measures; page unavailable) describes how neuropsychiatric symptoms were scored, but does not compare completers with non-completers. A search for non-completers and higher NPI scores found no such comparison in our copy. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

People with dementia have 1.4 to 4 times more hospital admissions than others with similar illnesses.

“People with dementia have 1·4 to 4 times more hospital admissions than others with similar illnesses.266, 268, 269, 270”

• cites [266] sourcePartly supported

  The Introduction reports that a study found higher rates of all-cause and preventable hospitalizations associated with dementia, with the effect varying by comorbidity burden. It does not give the claimed 1.4-to-4-fold range or establish that range for people with similar illnesses; this paper’s Results focus on Medicare expenditures, not hospital-admission rates. (LLM, conf=0.83)

  Experimental — accuracy not yet measured
• cites [268] sourceNot checked — no full text of the source
• cites [269] sourcePartly supported

  The passage labeled Abstract > Conclusions says hospitalization rates appear consistently higher for people with dementia than for those without dementia. It does not give the claimed 1.4-to-4-fold range or establish a comparison with people who have similar illnesses; searches for those details found no supporting passage in our copy. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

A further RCT of cognitively stimulating activities for people with delirium in dementia did not improve the delirium.

“A further RCT of cognitively stimulating activities for people with delirium in dementia did not improve the delirium.293”

• cites [293] sourceCould not verify

  The Methods describe longitudinal clinical-pathologic studies, and the Results report cognitive decline and neuropathology findings; neither section reports a randomized trial. Searches for cognitive stimulation and delirium found no passage addressing whether such activities improved delirium in people with dementia. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Hospitalisation in people with dementia is associated with adverse, unintended consequences, including distress, functional and cognitive decline, and high economic costs.

“Hospitalisation in people with dementia is associated with adverse, unintended consequences, including distress, functional and cognitive decline, and high economic costs.265, 266, 267”

• cites [265] sourcePartly supported

  The Results section reports higher Medicare expenditures and longer hospital stays among people with dementia than matched people without dementia, supporting the cost aspect. It treats functional and cognitive deficits as factors associated with hospitalization, not as declines resulting from it, and does not report distress as a consequence. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [266] sourcePartly supported

  The Introduction reports higher hospitalization rates among people with dementia, and the Results report higher Medicare expenditures with greater dementia severity and comorbidity. Neither passage establishes that hospitalization causes high costs, distress, or functional and cognitive decline; the expenditure measure covers all Medicare services, not hospitalization alone. Page numbers were not available in our copy. (LLM, conf=0.84)

  Experimental — accuracy not yet measured
• cites [267] sourcePartly supported

  The Results > Costs table reports hospital and outpatient-clinic costs for people with dementia, supporting the economic-cost aspect in a limited way. The Introduction discusses acute hospitalisation as a risk associated with caregiver overburden, but the paper does not link hospitalisation to distress or functional and cognitive decline, or establish that hospitalisation causes the reported costs. Page numbers are unavailable in our copy. (LLM, conf=0.83)

  Experimental — accuracy not yet measured

In the UK, detection rates have increased over the past 10 years.

“In the UK however, detection rates have increased over the past 10 years.281”

• cites [281] sourceCould not verify

  The Methods (Data Analysis; page unavailable) and Results (Mortality; page unavailable) address antipsychotic treatment outcomes, not UK delirium detection trends. Searches for UK detection rates and changes over a decade found no passage in our copy addressing the claim. (LLM, conf=0.75)

  Experimental — accuracy not yet measured

The impacts of COVID-19 on people with dementia might be particularly severe in LMICs, due to smaller health budgets for testing and protective equipment, capacity of health-care systems, quality of care home provision and patterns of workforce mobility.

“The impacts of COVID-19 on people with dementia might be particularly severe in LMICs, due to smaller health budgets for testing and protective equipment, capacity of health-care systems, quality of care home provision and patterns of workforce mobility.264”

• cites [264] sourceCould not verify

  Split into 2 atoms — 0 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 2 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured

High-quality care for people with dementia takes longer than caring for others with the same condition.

“High-quality care for people with dementia takes longer than caring for others with the same condition.278”

• cites [278] sourceCould not verify

  The Participants section says people with dementia were removed from the analytic sample, and the Discussion addresses cognitive decline after hospitalization. Neither addresses how long high-quality care takes for people with dementia compared with others with the same condition. Searches for the claim’s wording and for comparative care time found no supporting passage; page numbers were not provided in our copy. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

People with similar neuropathology show faster cognitive decline if they develop delirium than if they do not.

“People with similar neuropathology show faster cognitive decline if they develop delirium than if they do not.284”

• cites [284] sourcePartly supported

  The introduction (section D; page unavailable) says delirium is associated with permanent cognitive decline. It does not compare the rate of decline in people with similar neuropathology who do and do not develop delirium; the paper instead examines pharmacological interventions for delirium. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

Hospitalisation rates in people with dementia ranged from 0.37 to 1.26 per person-year in high-quality studies.

“Hospitalisation rates in people with dementia ranged from 0·37 to 1·26 per person-year in high-quality studies.”

• cites [271] sourceCould not verify

  The Introduction says that many people with dementia are admitted to hospital, but gives no hospitalisation rate. Searches of the full-text copy for 0.37–1.26 per person-year and for hospitalisation rates in high-quality studies found no passage reporting those figures. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

Thus, people with dementia are particularly vulnerable to COVID-19 because of their age, multimorbidity, and difficulties in maintaining physical distancing.

“Thus, people with dementia are particularly vulnerable to COVID-19 because of their age, multimorbidity, and difficulties in maintaining physical distancing.250, 251, 252”

• cites [250] sourcePartly supported

  The section “Cognitive difficulties related to psychological distress” (page unavailable) says infection may have more debilitating effects in people with pre-existing CNS disorders, including dementia-related conditions. It does not attribute vulnerability to age, multimorbidity, or difficulty maintaining physical distancing; searches for those factors found no supporting passage. (LLM, conf=0.78)

  Experimental — accuracy not yet measured
• cites [251] sourcePartly supported

  The Abstract and “Implement Physical, Not Social Distancing” section say that older adults, including those with cognitive or physical comorbidities, are vulnerable during the pandemic and that older adults and people with physical illnesses face particularly high risks from COVID-19. The paper does not specifically identify people with dementia or say they have difficulty maintaining physical distancing, so it supports only part of the attributed explanation. (LLM, conf=0.84)

  Experimental — accuracy not yet measured
• cites [252] sourcePartly supported

  In “Dementia care during COVID-19” (page unavailable), the paper describes older adults’ vulnerability and says people with dementia may struggle to follow safeguards and self-quarantine, increasing their chance of infection. It notes that many older adults who died had underlying health problems, but does not specifically identify multimorbidity among people with dementia as a reason for their vulnerability. (LLM, conf=0.83)

  Experimental — accuracy not yet measured

A moderation analysis showed that the relationship between Alzheimer's disease pathology and dementia status differed according to level of frailty (adjusted for age, sex, and education), with increasing frailty weakening the relationship between Alzheimer's disease pathology and dementia.

“A moderation analysis showed that the relationship between Alzheimer's disease pathology and dementia status differed according to level of frailty (adjusted for age, sex, and education) with increasing frailty weakening the relationship between Alzheimer's disease pathology and dementia (figure 10 ).22”

• cites [22] sourceSupported

The trajectory of dementia is often unpredictable.

“The trajectory of dementia is often unpredictable304”

• cites [304] sourcePartly supported

  The Introduction says the terminal phase of dementia is difficult to identify, and §4.3 Interpretation describes difficulty predicting the timing of death. These passages support unpredictability near the end of life, but do not establish that the overall trajectory of dementia is often unpredictable. (LLM, conf=0.82)

  Experimental — accuracy not yet measured

The 12 modifiable risk factors together account for about 40% of dementias worldwide.

“Together the 12 modifiable risk factors account for around 40% of worldwide dementias, which consequently could theoretically be prevented or delayed.”

• AssumptionThe authors state this as an assumption: The modifiable risk factors are causally related to dementia, so the population attributable fraction can be interpreted as the proportion of dementia that could be prevented or delayed by modifying them.

Nine potentially modifiable risk factors together are associated with 35% of the population attributable fraction of dementia worldwide, assuming causation.

“We previously calculated that nine potentially modifiable risk factors together are associated with 35% of the population attributable fraction (PAFs) of dementia worldwide: less education, high blood pressure, obesity, hearing loss, depression, diabetes, physical inactivity, smoking, and social isolation, assuming causation.2”

• cites [2] sourceNot checked — no full text of the source

• AssumptionThe authors state this as an assumption: The modifiable risk factors are causally related to dementia, so the population attributable fraction can be interpreted as the proportion of dementia that could be prevented or delayed by modifying them.

The attributable fraction for exposure to the highest three quartiles versus the lowest quartile of PM2·5 and NO2 was 6·1% (4·8-7·5).

“The attributable fraction for exposure to the highest three quartiles versus the lowest quartile of PM2·5 and NO2 was 6·1% (4·8–7·5).”

Risk factors overlap, as shown by the communality figures.

“Additionally, as our communality figures show, risk factors overlap.”

The weighted PAF for alcohol was 0·8.

“The weighted PAF was 0·8.”

The relative risk of dementia for those in the three highest quartiles of air pollution compared with the lowest was 1·09 (1·07-1·11).

“We calculated the RR of dementia for those in the three highest quartiles compared to the lowest was 1·09 (1·07–1·11).”

• AssumptionRests on an assumption: Animal models suggest that air pollution has specific physiological effects on dementia risk over and above those driven by life-course deprivation.

The relative risk of dementia associated with drinking more than 21 units (168 g) of alcohol weekly compared with lighter drinking was 1·18 (95% CI 1·06-1·31).

“The RR associated with drinking—more than 21 units (168 g) of alcohol weekly—compared with lighter drinking was 1·18 (95% Cl 1·06–1·31; figure 5 ).”

The weighted PAF for TBI was 3·4.

“The weighted PAF was 3·4.”

Knowledge of PET-measured amyloid and tau status and MRI-derived cortical thickness in a general population sample only adds a small improvement, which might not be clinically important for predicting memory decline over a model with clinical and genetic variables.

“Overall, the knowledge of PET-measured amyloid and tau status and MRI-derived cortical thickness in a general population derived sample, only adds a small improvement, which might not be clinically important for predicting memory decline over a model with clinical and genetic variables.186”

• cites [186] sourceNot checked — no full text of the source

No new evidence of medication effectiveness for neuropsychiatric symptoms exists.

“No new evidence of medication effectiveness for these symptoms exists”

Most research on delirium prevention has been in people without dementia.

“Most research on delirium prevention has been in people without dementia.”

Little high-quality research exists on managing delirium in dementia.

“Little high-quality research exists on managing delirium in dementia.”

People with dementia have more hospital admissions than other older people, including for illnesses that are potentially manageable at home.

“People with dementia have more hospital admissions than other older people, including for illnesses that are potentially manageable at home.”

Dementias attributable to the 12 modifiable risk factors could theoretically be prevented or delayed.

“Together the 12 modifiable risk factors account for around 40% of worldwide dementias, which consequently could theoretically be prevented or delayed.”

• AssumptionThe authors state this as an assumption: The modifiable risk factors are causally related to dementia, so the population attributable fraction can be interpreted as the proportion of dementia that could be prevented or delayed by modifying them.

No evidence supports pre-symptomatic diagnosis of dementia in everyday practice.

“no evidence exists to support pre-symptomatic diagnosis in everyday practice.”

Numbers of people with dementia in low-income and middle-income countries are rising faster than in high-income countries because of increases in life expectancy and greater risk factor burden.

“Numbers of people with dementia in LMIC are rising faster than in HIC because of increases in life expectancy and greater risk factor burden.”

A higher potential for dementia prevention exists in these countries than in global estimates that use data predominantly from high-income countries.

“Therefore a higher potential for dementia prevention exists in these countries than in global estimates that use data predominantly from HIC.”

• AssumptionThe authors state this as an assumption: The modifiable risk factors are causally related to dementia, so the population attributable fraction can be interpreted as the proportion of dementia that could be prevented or delayed by modifying them.

Acting now on dementia prevention, intervention, and care will greatly improve living and dying for individuals with dementia and their families, and thus for society.

“Acting now on dementia prevention, intervention, and care will vastly improve living and dying for individuals with dementia and their families, and thus society.”

• AssumptionThe authors state this as an assumption: The modifiable risk factors are causally related to dementia, so the population attributable fraction can be interpreted as the proportion of dementia that could be prevented or delayed by modifying them.

Mixed dementia is more common in the oldest adults, those older than 90 years.

“In the oldest adults (older than 90 years), in particular, mixed dementia is more common.”

Evidence is accumulating that psychosocial interventions tailored to the patient's needs are effective, at least in the short term, for managing neuropsychiatric symptoms.

“Evidence is accumulating for the effectiveness, at least in the short term, of psychosocial interventions tailored to the patient's needs, to manage neuropsychiatric symptoms.”

Dementia prevention is relevant at every stage of life, from early life to later life.

“It is never too early and never too late in the life course for dementia prevention.”

Maintaining physical health in people with dementia is important for their cognition.

“Keeping people with dementia physically healthy is important for their cognition.”

A growing evidence base supports the nine potentially modifiable dementia risk factors modelled by the 2017 Lancet Commission: less education, hypertension, hearing impairment, smoking, obesity, depression, physical inactivity, diabetes, and low social contact.

“Overall, a growing body of evidence supports the nine potentially modifiable risk factors for dementia modelled by the 2017 Lancet Commission on dementia prevention, intervention, and care: less education, hypertension, hearing impairment, smoking, obesity, depression, physical inactivity, diabetes, and low social contact.”

Little evidence exists that any single specific activity protects against dementia.

“although little evidence exists for any single specific activity protecting against dementia.”

In low-income and middle-income countries, limited access to secondary education and high or growing rates of hypertension, obesity, hearing loss, diabetes, and smoking mean that an even greater proportion of dementia is potentially preventable.

“In LMIC, not everyone has access to secondary education; high rates of hypertension, obesity, and hearing loss exist, and the prevalence of diabetes and smoking are growing, thus an even greater proportion of dementia is potentially preventable.”

• AssumptionThe authors state this as an assumption: The modifiable risk factors are causally related to dementia, so the population attributable fraction can be interpreted as the proportion of dementia that could be prevented or delayed by modifying them.

Public health measures that reduce head injury and harmful alcohol drinking could potentially lower young-onset and later-life dementia.

“Public health initiatives minimising head injury and decreasing harmful alcohol drinking could potentially reduce young-onset and later-life dementia.”

Using hearing aids appears to reduce the excess dementia risk associated with hearing loss.

“Using hearing aids appears to reduce the excess risk from hearing loss.”

Three additional dementia risk factors are added with newer convincing evidence: excessive alcohol consumption, traumatic brain injury, and air pollution.

“We now add three more risk factors for dementia with newer, convincing evidence. These factors are excessive alcohol consumption, traumatic brain injury, and air pollution.”

Stopping smoking, even in later life, reduces dementia risk.

“Stopping smoking, even in later life, ameliorates this risk.”

Preventative interventions might yield the largest dementia reductions in low-income and middle-income countries.

“Preventative interventions might yield the largest dementia reductions in LMIC.”

Antihypertensive treatment for hypertension is the only known effective preventive medication for dementia.

“antihypertensive treatment for hypertension is the only known effective preventive medication for dementia”

A US nationally representative survey of 2040 people older than 50 years, tested every two years for 18 years, found immediate and delayed recall deteriorated less after initiation of hearing aid use, adjusting for other risk factors.

“A US nationally representative survey of 2040 people older than 50 years, tested every two years for 18 years, found immediate and delayed recall deteriorated less after initiation of hearing aid use, adjusting for other risk factors.63”

• cites [63] sourceNot checked — no full text of the source

A third systematic review identified five high-quality studies, four group-delivered and one by computer, and concluded that evidence for the effects of cognitive training in mild cognitive impairment was insufficient to draw conclusions.

“A third systematic review identified five high quality studies, four group-delivered and one by computer, and concluded the evidence for the effects of cognitive training in mild cognitive impairment was insufficient to draw conclusions.53”

• cites [53] sourceNot checked — no full text of the source

A 25-year prospective study of 3777 people aged 65 years or older found increased dementia incidence in those with self-reported hearing problems except in those using hearing aids.

“A 25-year prospective study of 3777 people aged 65 years or older found increased dementia incidence in those with self-reported hearing problems except in those using hearing aids.61”

• cites [61] sourceNot checked — no full text of the source

The study excluded people who developed dementia less than 3 years after baseline to reduce reverse causation.

“The study excluded people developing dementia less than 3 years after baseline to reduce reverse causation.”

A nested case-control study of early-onset clinically diagnosed Alzheimer's disease within an established cohort also found TBI was a risk factor, increasing with number and severity.

“A nested case control study of early onset clinically diagnosed Alzheimer's disease within an established cohort also found TBI was a risk factor, increasing with number and severity.69”

• cites [69] sourceNot checked — no full text of the source

Hearing aid use was the largest factor protecting from decline (regression coefficient β for higher episodic memory 1.53; p<0.001) adjusting for protective and harmful factors.

“Hearing aid use was the largest factor protecting from decline (regression coefficient β for higher episodic memory 1·53; p<0·001) adjusting for protective and harmful factors.”

Risk factors in early life (education), midlife (hypertension, obesity, hearing loss, traumatic brain injury, and alcohol misuse), and later life (smoking, depression, physical inactivity, social isolation, diabetes, and air pollution) can contribute to increased dementia risk.

“Risk factors in early life (education), midlife (hypertension, obesity, hearing loss, traumatic brain injury, and alcohol misuse) and later life (smoking, depression, physical inactivity, social isolation, diabetes, and air pollution) can contribute to increased dementia risk (table 1 ).”

A meta-analysis of 17 controlled trials of at least 4 hours of computerised cognitive training (n=351, control n=335) for mild cognitive impairment found a moderate effect on general cognition post-training (Hedges' g=0.4, 0.2-0.5).

“A meta-analysis of 17 controlled trials of at least 4 hours of computerised cognitive training, (n=351, control n=335) for mild cognitive impairment, found a moderate effect on general cognition post-training (Hedges' g=0·4, 0·2–0·5);55”

• cites [55] sourceNot checked — no full text of the source

Hearing loss might result in cognitive decline through reduced cognitive stimulation.

“Hearing loss might result in cognitive decline through reduced cognitive stimulation.”

An overview of systematic reviews concluded there is convincing evidence that physical activity protects against clinically diagnosed Alzheimer's disease.

“A further overview of systematic reviews concluded that there is convincing evidence for physical activity protecting against clinically diagnosed Alzheimer's disease.”

• cites [88] sourceNot checked — no full text of the source

The fourth meta-analysis, focused on calcium channel blockers, found lowered dementia risk (RR 0.7, 95% CI 0.6-0.9).

“The fourth focused on people prescribed calcium channel blocker only, included 10 RCTs and observational studies comprising 75 239 hypertensive older adults (median age 72 years, median follow-up 8·2 years) found lowered dementia risk (RR 0·7, 95% CI 0·6–0·9).”

• cites [84] sourceNot checked — no full text of the source

Whether any particular diabetes medication reduces dementia risk is unclear.

“however, whether any particular medication ameliorates this risk is unclear.”

A Cochrane review found good evidence that statins do not prevent cognitive decline or dementia in older people at risk of vascular disease.

“A Cochrane review reported good evidence that statins given to older people at risk of vascular disease do not prevent cognitive decline or dementia.”

• cites [86] sourceNot checked — no full text of the source

A French study found alcohol use disorders associated with increased dementia risk in women and men.

“A French 5-year longitudinal study of over 31 million people admitted to hospital, found alcohol use disorders (harmful use or dependence as defined in ICD) were associated with increased dementia risk, calculated separately for men and women (women HR 3·3, 95% CI 3·3–3·4, men 3·4, 3·3–3·4).”

• cites [103] sourceNot checked — no full text of the source

Meta-analyses of longitudinal observational studies showed that exercise is associated with reduced dementia risk.

“Meta-analyses of longitudinal observational studies of 1–21 years duration showed exercise to be associated with reduced risk of dementia.”

• cites [2] sourceNot checked — no full text of the source

Intensive diabetic control does not decrease the risk of dementia.

“Intensive diabetic control does not decrease the risk of dementia.”

The HUNT study found that at least weekly midlife moderate-to-vigorous physical activity was associated with reduced dementia risk over 25 years, with wide confidence intervals.

“At least weekly midlife moderate-to-vigorous physical activity (breaking into a sweat) was associated with reduced dementia risk over a 25-year period of follow-up (HR 0·8, 95% CI 0·6–1·1) but the confidence intervals were wide.”

• cites [89] sourceNot checked — no full text of the source

SPRINT MIND was the first trial to suggest that risk for mild cognitive impairment can be reduced.

“making this the first trial to suggest reduction of risk for mild cognitive impairment.”

Overall, type 2 diabetes is a clear risk factor for future dementia.

“Overall type 2 diabetes is a clear risk factor for development of future dementia; however, whether any particular medication ameliorates this risk is unclear.”

A systematic review of light to moderate drinking reported reduced dementia risk compared with not drinking.

“A systematic review incorporating 45 studies of light to moderate drinking using a variety of definitions reported a reduced risk of dementia compared with not drinking (RR 0·7; 95% CI 0·6–0·91).”

• cites [104] sourceNot checked — no full text of the source

In earlier onset dementias (age under 65), 56.6% had an alcohol use disorder noted in their records.

“The relationship of dementia with alcohol use disorders was particularly clear in the earlier onset dementias (age less than 65 years) in which 56·6% had an alcohol use disorder noted in their records (n=57 353; 5·2% all dementias).”

• cites [103] sourceNot checked — no full text of the source

Reverse causation is possible, with depressive symptoms resulting from dementia neuropathology years before clinical dementia onset.

“Reverse causation is possible whereby depressive symptoms result from dementia neuropathology that occurs years before clinical dementia onset.”

• AssumptionRests on an assumption: Depression is associated with dementia incidence.
• AssumptionRests on an assumption: Depression is part of the prodrome and early stages of dementia.

The HUNT study suggested that symptoms of psychological distress predicted dementia 25 years later, with wide uncertainty.

“The Norwegian HUNT study, suggested that symptoms of psychological distress predicted dementia 25 years later however with wide bounds of uncertainty (HR 1·3, 95% CI 1·0–1·7).”

• cites [89] sourceNot checked — no full text of the source

A study of 755 people with mild cognitive impairment and a history of depression found that more than 4 years of SSRI treatment was associated with delayed progression to clinically diagnosed Alzheimer's disease.

“The study found that more than 4 years of such treatment was associated with delayed progression to clinically diagnosed Alzheimer's disease.”

• cites [119] sourceNot checked — no full text of the source

Smokers are at higher risk of dementia than non-smokers.

“Smokers are at higher risk of dementia than non-smokers,2 and at a higher risk of premature death before the age at which they might have developed dementia, introducing some bias and uncertainty in the association between smoking and risk of dementia.”

• cites [2] sourceNot checked — no full text of the source

A meta-analysis found that weight loss of at least 2 kg in overweight or obese adults with BMI greater than 25 was associated with significant improvement in attention and memory.

“A meta-analysis of seven RCTs (468 participants) and 13 longitudinal studies (551 participants) of overweight and obese adults without dementia, mean age 50 years, found weight loss of 2 kg or more in people with BMI greater than 25 was associated with a significant improvement in attention and memory.”

• cites [110] sourceNot checked — no full text of the source

It cannot be established from these data whether having multiple risk factors has an additive or synergistic effect.

“We cannot establish from these data if having multiple risk factors has an additive or synergistic effect.”

Reductions in prevalence and incidence in several HIC suggest that at least some of the risk factors estimated have a causal relationship with the clinical expression of dementia.

“Association does not prove causation, however, as already noted, the reductions in prevalence and incidence in several HIC suggests that at least some of the risk factors estimated here do have a causal relationship with the clinical expression of dementia.”

• AssumptionThe authors state this as an assumption: The model assumes a causal relationship between the 12 risk factors and dementia.

Around 40% of all cases of dementia are associated with 12 potentially modifiable risk factors.

“We find a hopeful picture with an estimate of around 40% of all cases of dementia being associated with 12 potentially modifiable risk factors.”

• AssumptionThe authors state this as an assumption: The model assumes a causal relationship between the 12 risk factors and dementia.

Targeting high-risk populations might be more effective for dementia prevention.

“suggesting that targeting high-risk populations might be more effective.”

The correction for education, which is strongly inversely linked to deprivation, will address at least some of the confounding in the air pollution association.

“We also considered the overlap with education for this and other risk factors and the correction for education, strongly inversely linked to deprivation, will address at least some of the confounding.”

A meta-analysis of five RCTs (n=1888) found a weak effect of Mediterranean diet on global cognition (SMD 0·2, 95% CI 0·0-0·5).

“A further meta-analysis identified five RCTs (n=1888) with a weak effect on global cognition (SMD 0·2, 95% Cl 0·0–0·5)154”

• cites [154] sourceNot checked — no full text of the source

Sufficient new evidence supports adding three additional modifiable risk factors for dementia to the 2017 Commission model: excessive alcohol, traumatic brain injury, and air pollution.

“We judge that sufficient new evidence supports adding three additional modifiable risk factors for dementia to our 2017 Commission model (excessive alcohol, traumatic brain injury, and air pollution).”

• AssumptionThe authors state this as an assumption: The model assumes a causal relationship between the 12 risk factors and dementia.

The longitudinal evidence linking potentially modifiable risk factors to dementia generally fulfils causality criteria in observational data (strength, consistency, biological plausibility, temporality, dose-response, coherence, and quasi-experimental studies).

“The longitudinal evidence linking potentially modifiable risk factors to dementia generally fulfils causality criteria in observational data (strength, consistency, biological plausibility, temporality, dose–response, coherence, and quasi-experimental studies, for example, more education or using hearing aids).”

• AssumptionThe authors state this as an assumption: The model assumes a causal relationship between the 12 risk factors and dementia.

A U-shaped association has been reported between sleep duration and risk of mild cognitive impairment or dementia, with higher risks for less than 5 hours and more than 10 hours.

“A U-shaped association has been reported between sleep duration and risk of mild cognitive impairment or dementia with higher risks of dementia with less than 5 hours (HR=2·6; 95% CI 1·4–5·1) compared with more than 5 and less than 7 and more than 10 hours sleep (2·2, 1·4–3·5) and risks for all-cause dementia and clinically diagnosed Alzheimer's disease being similar.”

• cites [135] sourceNot checked — no full text of the source
• cites [139] sourceNot checked — no full text of the source
• cites [140] sourceNot checked — no full text of the source

People taking hypnotics were at greater dementia risk than those who did not, regardless of sleep duration.

“Those taking hypnotics were at greater risk of dementia than those who did not regardless of sleep duration.”

• cites [139] sourceNot checked — no full text of the source

Because meta-analysis was not possible, data from the only study of all-cause air pollution with all-cause dementia outcome and low-moderate risk of bias were used.

“As meta-analysis was not possible, we used data from the only study of all-cause air pollution with the outcome of all-cause dementia, with low-moderate risk of bias.”

When a risk is measured nearer to the age of dementia onset, prodromal change is more likely to affect or even cause it.

“When measuring a risk nearer to the age of dementia onset, then it is more likely that prodromal change affects, or even causes it.”

The postulated mechanism that reduced sleep leads to Alzheimer's-type pathology is inconsistent with evidence that both more sleep and less sleep increase dementia risk.

“The postulated mechanisms of reduced sleep leading to accumulation of Alzheimer's type pathology is inconsistent with the evidence that both more sleep and less sleep are associated with increased risk of dementia.”

Mediterranean or similar Nordic diets might reduce cognitive decline and dementia.

“There has been a move towards considering the evidence base for whole diets in the last 5 years, particularly high plant intake such as in the Mediterranean diet (high intake of vegetables, legumes, fruits, nuts, cereals, and olive oil; low intake of saturated lipids and meat) or the similar Nordic diet, rather than individual nutrients, which might reduce cognitive decline and dementia.”

• cites [145] sourceNot checked — no full text of the source

Mediterranean diet has no benefit for incident cognitive impairment or dementia.

“but no benefit of Mediterranean diet for incident cognitive impairment or dementia.”

• cites [154] sourceNot checked — no full text of the source

Data from RCTs on interventions to prevent cognitive decline, all-cause dementia, or Alzheimer's disease are few.

“Data from RCTs on interventions to prevent cognitive decline, all-cause dementia, or Alzheimer's disease are few.”

For some key life influences, only observational data, particularly from natural experiments such as changing the statutory education age, are possible.

“For some key life influences, only observational data, particularly related to natural experiments such as changing the statutory education age, are possible.”

Extensive testing in trials has not led to signals of beneficial effects for additional vitamins, oils, or mixed dietary supplements in preventing dementia.

“We do not recommend taking additional vitamins, oils, or mixed dietary supplements as a means of preventing dementia as extensive testing in trials has not led to signals of beneficial effects.”

Using intermediate endpoints such as cognition and dementia onset in research remains uncertain because no intermediate markers with a close relationship to dementia outcomes exist that would allow prediction with certainty for any given individual, age, and sex.

“Using intermediate endpoints, such as cognition, and dementia onset in research remains uncertain because no intermediate markers with such a close relationship to dementia outcomes exist that it would be possible to predict with certainty for any given individual, age, and sex.”

Most people who are amyloid positive with no other markers have not developed Alzheimer's disease dementia during their lifetime.

“Most people who are amyloid positive with no other markers have not developed Alzheimer's disease dementia during their lifetime.”

Amyloid imaging is not a diagnostic test for dementia.

“Amyloid imaging is not a diagnostic test for dementia.”

Underlying neurobiological mechanisms might underpin neuropsychiatric symptoms.

“This suggests that underlying neurobiological mechanisms might underpin neuropsychiatric symptoms.”

Evidence is slowly accumulating for the effectiveness, at least in the short term, of person-centred evidence-based psychosocial interventions.

“Evidence is slowly accumulating for the effectiveness, at least in the short term, of person-centred evidence-based psychosocial interventions.”

Rigorous systematic reviews by the US Task Force on Prevention found an absence of evidence of benefit and harm for screening of those not presenting with concerns.

“rigorous systematic reviews by the US Task Force on Prevention have found an absence of evidence of benefit and harm.196”

• cites [196] sourceNot checked — no full text of the source

The diagnostic value of biomarkers has not been addressed in different representative populations, particularly not in those from LMIC.

“The value of biomarkers, in terms of diagnostic value, has not been addressed in different representative populations and particularly not in those from LMIC.”

The between-group reduction in neuropsychiatric symptoms was greater than expected from extrapolating other study results with antipsychotic medication.

“This between-group reduction in neuropsychiatric symptoms was greater than that expected, extrapolating from other study results, with antipsychotic medication.”

These drugs show substantial impact during treatments at therapeutic concentrations on the leakiness of blood vessels.

“These drugs also show substantial impact during treatments at so-called therapeutic concentrations on the leakiness of blood vessels.”

New psychotic symptoms in people with dementia are often due to delirium.

“new psychotic symptoms are often due to delirium”

• cites [2] sourceNot checked — no full text of the source

The WHELD study found lower Cohen Mansfield Agitation Inventory scores at 9 months (MD −4.3 points, 95% CI −7.3 to −1.2).

“finding lower Cohen Mansfield Agitation Inventory (CMAI) at 9 months (MD −4·3 points, 95% CI −7·3 to −1·2).219”

• cites [219] sourceNot checked — no full text of the source

A major gap remains in knowledge about people living at home, who comprise the majority of those with dementia.

“Thus a major gap remains in knowledge about people living at home who comprise the majority of those with dementia.”

People with dementia might be wrongly thought to have delusions when they misremember.

“People with dementia might be wrongly thought to have delusions when they misremember”

• cites [2] sourceNot checked — no full text of the source

People who have Alzheimer's disease pathology without developing dementia tend to have fewer age-related health deficits than those who develop it with even low concentrations of plaques and tangles.

“People who have Alzheimer's disease pathology without developing dementia tend to have fewer age-related health deficits than those who develop it with even low concentrations of plaques and tangles.301”

• cites [301] sourceNot checked — no full text of the source

Lack of restrictions means that visitors might also be at elevated risk.

“Lack of restrictions means that the visitors might also be at elevated risk.261”

• cites [261] sourceNot checked — no full text of the source

Dementia and delirium frequently occur together.

“Dementia and delirium frequently occur together.”

Admissions are often for conditions that might be manageable in the community (potentially preventable hospitalisations).

“Admissions are often for conditions that might be manageable in the community (potentially preventable hospitalisations).268”

• cites [268] sourceNot checked — no full text of the source

Capacity to make abstract decisions, including about the future, might be lost early in dementia.

“Capacity to make abstract decisions, including about the future, might be lost early in dementia.307”

• cites [307] sourceNot checked — no full text of the source

Dementia is more readily being included on death certificates, which accounts for some of the rise.

“Dementia is more readily being included on death certificates, which accounts for some of the rise.”

People might not be able to predict their future wishes.

“However, people might not be able to predict their future wishes.”