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Prevalence of Alzheimer's Disease in a Community Population of Older Persons: Higher Than Previously Reported
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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“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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“In those over 85 recent data suggest that dementia may occur in nearly half( 21 ).”
BackgroundDisruption of zinc homeostasis in Alzheimer's disease
Robertson, J. D., Crafford, A. M., Markesbery, W. R., et al. (2002) · Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms · doi:10.1016/s0168-583x(01)01124-7 · Cited by 12
The Application of Health Care Surrogate Laws to Older Populations: How Good a Match?
Hayley, D. C., Stern, R., Stocking, C., et al. (1996) · Journal of the American Geriatrics Society · doi:10.1111/j.1532-5415.1996.tb02437.x · Cited by 12
Age-Related Change in Cognitive Function
Wilson, R. S., Bennett, D. A., & Swartzendruber, A. L. (1997) · Critical issues in neuropsychology · doi:10.1007/978-1-4899-1857-4_2 · Cited by 14
He, G., Zhou, Y., Li, M., Guo, Y., Yin, H., Yang, B., Zhang, S., & Liu, Y. (2021) · Frontiers in Bioengineering and Biotechnology · doi:10.3389/fbioe.2021.777344 · Cited by 11
Cell-specific copper dyshomeostasis mechanism in Alzheimer’s disease
Okafor, M., Faller, P., & Vitale, N. (2025) · Translational Neurodegeneration · doi:10.1186/s40035-025-00504-6 · Cited by 16
“The chance of developing AD doubles every 5 years after 65 and reaches up to 50% after 85 years of age [35].”
When time's arrow doesn't bend: APOE-ε4 influences episodic memory before old age
Eich, T. S., Tsapanou, A., & Stern, Y. (2019) · Neuropsychologia · doi:10.1016/j.neuropsychologia.2019.107180 · Cited by 13
Population Base Rates and Disease Course of Common Psychiatric and Neurodegenerative Disorders
Andren, K. A. K., Gabel, N., Stelmokas, J., Rich, A. M., & Bieliauskas, L. A. (2017) · Neuropsychology Review · doi:10.1007/s11065-017-9357-1 · Cited by 11
“…from 2.32% (95% CI = 1.26–3.37) among ages 71–79 to 29.70% (95% CI = 18.60–40.80) among ages ≥90; U.S. (Plassman et al. 2007) 2% of Americans age 65–74; 42% in those 85 and older (Lezak et al. 2012) 10.3% (95% CL = 8.1 and 12.5) of people over age 65; U.S. (Evans et al. 1989) 67/1000 [6.7”
InfluentialTang‐Wai, D. F., Josephs, K. A., & Petersen, R. C. (2005) · Cambridge University Press eBooks · doi:10.1017/cbo9780511544873.029 · Cited by 11
Metadata
- Authors
- Evans, D. A.
- Corresponding author
- Evans, Denis A.
- ORCID
- Evans, Denis A.
- Venue
- JAMA
- Publisher
- American Medical Association (AMA)
- 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
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › 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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