Cited by 225Dementia and Cognitive Impairment ResearchThyroid Disorders and TreatmentsAlzheimer's disease research and treatments

Thyroid Function and the Risk of Alzheimer Disease<subtitle>The Framingham Study</subtitle>

Open access
Tan, Zaldy S.·2008·Archives of Internal Medicine

Abstract

BACKGROUND: Clinical hypothyroidism and hyperthyroidism are recognized causes of reversible dementia, but previous studies relating thyrotropin levels to cognitive performance in clinically euthyroid persons have yielded inconsistent results. METHODS: We related serum thyrotropin concentrations measured at baseline (March 1977-November 1979) to the risk of Alzheimer disease (AD) in 1864 cognitively intact, clinically euthyroid Framingham original cohort participants (mean age, 71 years; 59% women). Sex-specific Cox proportional hazards models were constructed using tertiles of thyrotropin concentration (tertile 2 as the referent) and adjusting for age, apolipoprotein E epsilon4 allele status, educational level, plasma homocysteine level, current smoking, body mass index, prevalent stroke, and atrial fibrillation. RESULTS: During a mean follow-up of 12.7 years (range, 1-25 years), 209 participants (142 women) developed AD. Women in the lowest (<1.0 mIU/L) and highest (>2.1 mIU/L) tertiles of serum thyrotropin concentration were at increased risk for AD (multivariate-adjusted hazard ratio, 2.39 [95% confidence interval, 1.47-3.87] [P < .001] and 2.15 [95% confidence interval, 1.31-3.52] [P = .003], respectively) compared with those in the middle tertile. Thyrotropin levels were not related to AD risk in men. Analyses excluding individuals receiving thyroid supplementation did not significantly alter these relationships. In analyses limited to participants with serum thyrotropin levels of 0.1 to 10.0 mIU/L, the U-shaped relationship between thyrotropin level and AD risk was maintained in women but not when analyses were limited to those with thyrotropin levels of 0.5 to 5.0 mIU/L. CONCLUSION: Low and high thyrotropin levels were associated with an increased risk of incident AD in women but not in men.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1001/archinte.168.14.1514

Cites

60 of 60 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. [23]Wahlin A Bunce D Wahlin TR Longitudinal evidence of the impact of normal thyroid stimulating hormone variations on cognitive functioning in very old age Psychoneuroendocrinology 2005 30 625 637 15854779

Cited by

Sorted by citations

Authors
Tan, Z. S.
Affiliations
Beth Israel Deaconess Medical Center (US)
Corresponding author
Tan, Zaldy S.
Venue
Archives of Internal Medicine
Published
2008-07-28
Volume
168
Issue
14
Pages
1514
ISSN
0003-9926 (ISSN-L)
OpenAlex
W2076559674
Cited by
225
References
58
Citations by year
2026: 12 · 2025: 8 · 2024: 21 · 2023: 13 · 2022: 10 · 2021: 20 · 2020: 15 · 2019: 17 · 2018: 10 · 2017: 7 · 2016: 17 · 2015: 13 · 2014: 9 · 2013: 15 · 2012: 14
FWCI
5.62
Type
journal article
Language
en
Open access
Locations
  • Archives of Internal Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (n01hc25195-41-0-1)
  • National Institute on Aging (5R01 AG 16495, R01AR/AG 41398, R01 AR/AG 47785, R01AG016495, 5-R01-AG-08122, R01AG008122)
  • National Heart, Lung, and Blood Institute (K-24-HL-04334, N01‐HC25195, K24HL004334, N01-HC-025195)
  • National Institute of Neurological Disorders and Stroke (5-R01-NS-17950, R01NS017950)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (P60AR047785, R01AR041398)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
Alzheimer's disease, thyroid-stimulating hormone, thyroid function, serum TSH, dementia risk, sex differences, euthyroidism, thyroid hormones, APOE ε4, homocysteine
MeSH terms
Aged, Alzheimer Disease, Female, Follow-Up Studies, Humans, Luminescent Measurements, Male, Prognosis, Retrospective Studies, Risk Factors, Sex Factors, Thyroid Gland, Thyrotropin, Time Factors, United States, Incidence, Confidence Intervals, Proportional Hazards Models, Disease Progression

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review