Cited by 1,226Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsAging, Health, and Disability

Prevalence of Alzheimer's Disease in a Community Population of Older Persons: Higher Than Previously Reported

Evans, Denis A.·1989·JAMA

Abstract

Clinically diagnosed Alzheimer's disease and other dementing illnesses were assessed in a geographically defined US community. Of 3623 persons (80.8% of all community residents over 65 years of age) who had brief memory testing in their homes, a stratified sample of 467 persons underwent neurological, neuropsychological, and laboratory examination. Prevalence rates of Alzheimer's disease were calculated for the community population from the sample undergoing clinical evaluation. Of those over the age of 65 years, an estimated 10.3% (95% confidence limits, 8.1% and 12.5%) had probable Alzheimer's disease. This prevalence rate was strongly associated with age. Of those 65 to 74 years old, 3.0% (95% confidence limits, 0.8 and 5.2) had probable Alzheimer's disease, compared with 18.7% (95% confidence limits, 13.2 and 24.2) of those 75 to 84 years old and 47.2% (95% confidence limits, 37.0 and 63.2) of those over 85 years. Other dementing conditions were uncommon. Of community residents with moderate or severe cognitive impairment, 84.1% had clinically diagnosed Alzheimer's disease as the only probable diagnosis. These data suggest that clinically diagnosed Alzheimer's disease is a common condition and that its public health impact will continue to increase with increasing longevity of the population. (JAMA. 1989;262:2551-2556)

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Crossref · 10.1001/jama.1989.03430180093036

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  • Based on studies that show clinical AD, MCI, and preclinical AD are common in the elderly, by the new scheme the vast majority of those past the age of 85 have AD.

    “Based on studies that show clinical AD [6, 8], MCI [88], and preclinical AD [67] are common in the elderly, by this scheme that vast majority of those past the age of 85 have AD (Figure 2).”

    From Brain aging, Alzheimer's disease, and mitochondria (2011) · cites this paper as [6]

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Authors
Evans, D. A.
Corresponding author
Evans, Denis A.
Venue
JAMA
Published
1989-11-10
Volume
262
Issue
18
Pages
2551
ISSN
  • 0002-9955 (ISSN-L)
  • 0098-7484
OpenAlex
W2129678592
Cited by
1,226
References
0
Citations by year
2026: 6 · 2025: 11 · 2024: 13 · 2023: 15 · 2022: 9 · 2021: 20 · 2020: 22 · 2019: 17 · 2018: 20 · 2017: 18 · 2016: 28 · 2015: 23 · 2014: 17 · 2013: 32 · 2012: 25
FWCI
44.57
Type
journal article
Language
en
Open access
closed
Locations
  • JAMA (publishedVersion)
  • DigitalGeorgetown (Georgetown University Library) (submittedVersion)
Funders
National Institute on Aging (N01-AG02107, N01‐AG‐1‐2106, AG 06789)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Aging, Health, and Disability
Keywords
Alzheimer's disease, prevalence, older adults, dementia, age-related cognitive decline, community-dwelling older adults, cognitive impairment, age differences in prevalence, public health impact

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