Cognitive Aging in Black and White Americans: Cognition, Cognitive Decline, and Incidence of Alzheimer Disease Dementia

Jennifer Weuve, Lisa L. Barnes, Carlos F. Mendes de Leon, Kumar Rajan, Todd Beck, Neelum T. Aggarwal, Liesi E. Hebert, David A. Bennett, Robert S. Wilson, Denis A. Evans

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Background: US-based studies have reported that older blacks perform worse than older whites on cognitive tests and have higher risk of Alzheimer disease dementia (AD). It is unclear whether these findings reflect differences in cognitive decline. Methods: The Chicago Health and Aging Project followed individuals, 65+ years old (64% black, 36% white), for up to 18 years. Participants underwent triennial cognitive assessments; stratified randomized samples underwent assessments for AD. We compared black and white participants’ cognitive performance, cognitive decline rate (N = 7,735), and AD incidence (N = 2,144), adjusting for age and sex. Results: Black participants performed worse than white participants on the cognitive tests; 441 participants developed AD. Black participants’ incident AD risk was twice that of whites (RR = 1.9; 95% CI, 1.4, 2.7), with 58 excess cases/1,000 occurring among blacks (95% CI, 28, 88). Among noncarriers of APOE ε4, blacks had 2.3 times the AD risk (95% CI, 1.5, 3.6), but among carriers, race was not associated with risk (RR = 1.1; 95% CI, 0.6, 2.0; Pinteraction = 0.05). However, cognitive decline was not faster among blacks: the black-white difference in 5-year change in global cognitive score was 0.007 standard unit (95% CI, −0.034, 0.047). Years of education accounted for a sizable portion of racial disparities in cognitive level and AD risk, in analyses using a counterfactual approach. Conclusions: The higher risk of AD among blacks may stem from lower level of cognitive test performance persisting throughout the observation period rather than faster rate of late-life cognitive decline. Disparities in educational attainment may contribute to these performance disparities. See video abstract at, http://links.lww.com/EDE/B299.

Original languageEnglish (US)
Pages (from-to)151-159
Number of pages9
JournalEpidemiology
DOIs
StateAccepted/In press - Jan 1 2018
Externally publishedYes

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Cognition
Alzheimer Disease
Incidence
Cognitive Aging
hydroquinone
Cognitive Dysfunction
Observation

ASJC Scopus subject areas

  • Epidemiology

Cite this

Weuve, J., Barnes, L. L., Mendes de Leon, C. F., Rajan, K., Beck, T., Aggarwal, N. T., ... Evans, D. A. (Accepted/In press). Cognitive Aging in Black and White Americans: Cognition, Cognitive Decline, and Incidence of Alzheimer Disease Dementia. Epidemiology, 151-159. https://doi.org/10.1097/EDE.0000000000000747

Cognitive Aging in Black and White Americans : Cognition, Cognitive Decline, and Incidence of Alzheimer Disease Dementia. / Weuve, Jennifer; Barnes, Lisa L.; Mendes de Leon, Carlos F.; Rajan, Kumar; Beck, Todd; Aggarwal, Neelum T.; Hebert, Liesi E.; Bennett, David A.; Wilson, Robert S.; Evans, Denis A.

In: Epidemiology, 01.01.2018, p. 151-159.

Research output: Contribution to journalArticle

Weuve, J, Barnes, LL, Mendes de Leon, CF, Rajan, K, Beck, T, Aggarwal, NT, Hebert, LE, Bennett, DA, Wilson, RS & Evans, DA 2018, 'Cognitive Aging in Black and White Americans: Cognition, Cognitive Decline, and Incidence of Alzheimer Disease Dementia', Epidemiology, pp. 151-159. https://doi.org/10.1097/EDE.0000000000000747
Weuve, Jennifer ; Barnes, Lisa L. ; Mendes de Leon, Carlos F. ; Rajan, Kumar ; Beck, Todd ; Aggarwal, Neelum T. ; Hebert, Liesi E. ; Bennett, David A. ; Wilson, Robert S. ; Evans, Denis A. / Cognitive Aging in Black and White Americans : Cognition, Cognitive Decline, and Incidence of Alzheimer Disease Dementia. In: Epidemiology. 2018 ; pp. 151-159.
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abstract = "Background: US-based studies have reported that older blacks perform worse than older whites on cognitive tests and have higher risk of Alzheimer disease dementia (AD). It is unclear whether these findings reflect differences in cognitive decline. Methods: The Chicago Health and Aging Project followed individuals, 65+ years old (64{\%} black, 36{\%} white), for up to 18 years. Participants underwent triennial cognitive assessments; stratified randomized samples underwent assessments for AD. We compared black and white participants’ cognitive performance, cognitive decline rate (N = 7,735), and AD incidence (N = 2,144), adjusting for age and sex. Results: Black participants performed worse than white participants on the cognitive tests; 441 participants developed AD. Black participants’ incident AD risk was twice that of whites (RR = 1.9; 95{\%} CI, 1.4, 2.7), with 58 excess cases/1,000 occurring among blacks (95{\%} CI, 28, 88). Among noncarriers of APOE ε4, blacks had 2.3 times the AD risk (95{\%} CI, 1.5, 3.6), but among carriers, race was not associated with risk (RR = 1.1; 95{\%} CI, 0.6, 2.0; Pinteraction = 0.05). However, cognitive decline was not faster among blacks: the black-white difference in 5-year change in global cognitive score was 0.007 standard unit (95{\%} CI, −0.034, 0.047). Years of education accounted for a sizable portion of racial disparities in cognitive level and AD risk, in analyses using a counterfactual approach. Conclusions: The higher risk of AD among blacks may stem from lower level of cognitive test performance persisting throughout the observation period rather than faster rate of late-life cognitive decline. Disparities in educational attainment may contribute to these performance disparities. See video abstract at, http://links.lww.com/EDE/B299.",
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AU - Beck, Todd

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