Incidence of Alzheimer's disease in a rural community in India: the Indo-US study.

TitleIncidence of Alzheimer's disease in a rural community in India: the Indo-US study.
Publication TypeJournal Article
Year of Publication2001
AuthorsChandra V, Pandav R, Dodge HH, Johnston JM, Belle SH, DeKosky ST, Ganguli M
JournalNeurology
Volume57
Issue6
Pagination985-9
Date Published2001 Sep 25
ISSN0028-3878
KeywordsAge Factors, Aged, Aged, 80 and over, Alzheimer Disease, Cross-Cultural Comparison, Cross-Sectional Studies, Developing Countries, Female, Humans, Incidence, India, Male, Middle Aged, Rural Population, United States
Abstract

OBJECTIVE: To determine overall and age-specific incidence rates of AD in a rural, population-based cohort in Ballabgarh, India, and to compare them with those of a reference US population in the Monongahela Valley of Pennsylvania.

METHODS: A 2-year, prospective, epidemiologic study of subjects aged > or =55 years utilizing repeated cognitive and functional ability screening, followed by standardized clinical evaluation using the Diagnostic and Statistical Manual of Mental Disorders, 4th edition, and the National Institute of Neurological and Communicative Disorders and Stroke-Alzheimer's Disease and Related Disorders Association criteria for the diagnosis, and the Clinical Dementia Rating scale for the staging, of dementia and AD.

RESULTS: Incidence rates per 1000 person-years for AD with CDR > or =0.5 were 3.24 (95% CI: 1.48-6.14) for those aged > or =65 years and 1.74 (95% CI: 0.84-3.20) for those aged > or =55 years. Standardized against the age distribution of the 1990 US Census, the overall incidence rate in those aged > or =65 years was 4.7 per 1000 person-years, substantially lower than the corresponding rate of 17.5 per 1000 person-years in the Monongahela Valley.

CONCLUSION: These are the first AD incidence rates to be reported from the Indian subcontinent, and they appear to be among the lowest ever reported. However, the relatively short duration of follow-up, cultural factors, and other potential confounders suggest caution in interpreting this finding.

Alternate JournalNeurology
PubMed ID11571321
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