Time Trend in Persistent Cognitive Decline: Results From the Longitudinal Aging Study Amsterdam. (16th April 2018)

• Record Type: Journal Article
• Authors: van den Kommer, Tessa N; Deeg, Dorly J H; van der Flier, Wiesje M; Comijs, Hannie C
• Is Part Of: Journals of gerontology. Volume 73(2018)Supplement 1
• Page Start: S57
• Page End: S64
• Publication Date: 2018-04-16
• Subjects: Dementia -- Incidence -- Older adults -- Risk factors; Geriatrics -- Periodicals; Gerontology -- Periodicals; Aged -- Periodicals; Aging -- Periodicals; Psychology, Social -- Periodicals; 305.26
• DOI: 10.1093/geronb/gbx151
• Languages: English
• ISSNs: 1079-5014

Abstract

Abstract: Objective: To study time trends in the incidence of persistent cognitive decline (PCD), and whether an increase or decrease is explained by changes in well-known risk factors of dementia. Method: Data from the Longitudinal Aging Study Amsterdam over a period of 20 years were used. Subsamples of 65–88 year-olds were selected at 7 waves, with numbers ranging from 1, 800 to 1, 165. Within-person change in cognitive functioning was used to determine PCD. In logistic generalized estimating equations (GEE), time (0, 3, 6, 9, 13, and 16 years) was the main predictor of 3-year PCD incidence. Explanatory variables were lagged one wave before incident PCD and included in separate models. Results: PCD incidence was 2.5% at first, and 3.4% at last follow-up. GEE showed a positive time trend for PCD incidence [Exp(B)time = 1.042; p < .001]. None of the explanatory variables significantly changed the strength of the regression coefficient of linear time. Higher age, lower education, diabetes mellitus, smoking, lower body-mass index, and lower level of physical activity were associated with higher incidence of PCD. Conclusion: An increase in PCD incidence over time was found. Although well-known risk factors were associated with incidence per se, they did not explain the increase in incidence of PCD.