Background: Both education and cardiovascular risk factors are strongly associated with dementia risk. However, it is not clear whether these associations persist or vary among individuals with high genetic risk for Alzheimer's disease. We examined the interactive relationship between lifestyle and genetic dementia risk factors in a prospective cohort study. Methods: Our data came from the Atherosclerosis Risk in Communities study participants (n = 13 715; baseline age 45-64; 25% Black; 55% female), who were followed for incident dementia from 1987 through 2017. We used Cox proportional hazard models to estimate the risk of dementia (ascertained through in-person examination, telephone cognitive screeners, and/or hospital and death records) associated with baseline education and cardiovascular risk factors (measured using the American Heart Association's "Life Simple 7") among ϵ4 carriers and non-carriers separately. We also examined differences by race and sex. Results: Two thousand two hundred and twenty-six incident dementia cases occurred over a median 25 years of follow-up. Lower educational attainment and poorer cardiovascular health were associated with greater risk of incident dementia. There was an education by apolipoprotein E (APOE) status interaction (p =. 005) whereby the association of education and dementia was weaker for ϵ4 carriers (HR college graduates vs less than high school: 0.71 [0.59-0.84] than non-carriers (0.54 [0.47-0.63]). There was no interaction between APOE status and cardiovascular health on dementia risk. These relationships did not vary significantly by race or sex. Conclusions: Education and cardiovascular health were associated with lower dementia risk regardless of APOE genotype, though the protective effects of education were somewhat diminished among ϵ4 carriers.
|Original language||English (US)|
|Number of pages||9|
|Journal||Journals of Gerontology - Series A Biological Sciences and Medical Sciences|
|State||Published - Jun 1 2022|
Bibliographical notePublisher Copyright:
© 2021 The Author(s) 2021. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved.
- Cognitive aging
- Gene by environment
- Life Simple 7
PubMed: MeSH publication types
- Journal Article