Depression, apolipoprotein E genotype, and the incidence of mild cognitive impairment: a prospective cohort study

Archives of Neurology
Yonas E GedaWalter A Rocca

Abstract

It remains unknown whether depression and apolipoprotein E genotype are risk factors for incident mild cognitive impairment (MCI). To determine whether elderly individuals with depression (measured by the short Geriatric Depression Scale) are at increased risk of developing incident MCI. Prospective cohort study. Primary care clinic. A cohort of 840 cognitively normal elderly subjects without depression at recruitment who were followed up prospectively for a median of 3.5 years (range, 0.4-12.8 years). Subjects who developed depression (score of >/=6 on the short Geriatric Depression Scale; depression cohort) were compared with all remaining subjects (referent cohort). Incidence of MCI (primary outcome) and incidence of MCI or dementia (composite secondary outcome). Individuals in the depression cohort were at significantly increased risk of subsequent incident MCI (hazard ratio [HR], 2.2; 95% confidence interval [CI], 1.2-4.1) after adjusting for age (time scale), sex, and education, and considering dementia as a competing outcome. The association was stronger in men but did not vary by severity of depression. We observed a synergistic interaction between apolipoprotein E genotype (epsilon3/epsilon4 or epsilon4/epsilon4) and d...Continue Reading

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