Secular Trends in Cognitive Performance in Older Black and White U.S. Adults, 1993–2012: Findings From the Chicago Health and Aging Project

ScD Jennifer WeuveMPH, Kumar B RajanPhD, Lisa L BarnesPhD, Robert S WilsonPhD and Denis A EvansMD

The Journals of Gerontology: Series B, 2018, vol. 73, issue suppl_1, S73-S81

Abstract: ObjectiveTo characterize secular trends from 1993 to 2012 in cognitive performance using a cohort of older black and white U.S. adults, and compare trends by race.MethodOur data come from 8,906 participants of the Chicago Health and Aging Project (CHAP), a longitudinal, population-based cohort (age ≥ 67, 60% black). Participants underwent cognitive assessments in six 3-year study cycles from 1993 to 1996 through 2010 to 2012. We computed 3 measures of cognitive performance: global cognition, episodic memory, and perceptual speed.ResultsMean performance in terms of global cognitive score followed a secular pattern of modest decline over the 6 study cycles. The trend was most pronounced for perceptual speed. Mean scores among black participants were consistently lower than those for whites; these disparities in mean performance narrowed over time, especially on perceptual speed, but appeared to widen at the last cycle. Global scores among the upper quartile of performers rose slightly, but scores among the lowest quartile of performers dropped precipitously.DiscussionBetween 1993 and 2012, secular trends in cognitive performance in this established cohort did not follow a clear pattern of improvement, contrasting with previous research. But patterns differed by cognitive domain, performance level, and race.

Keywords: Cognition; Epidemiology; Health disparities; Race (search for similar items in EconPapers)
Date: 2018
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The Journals of Gerontology: Series B is currently edited by Psychological Sciences - S. Duke Han, PhD and Social Sciences - Jessica A Kelley, PhD, FGSA

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