Do depressive symptoms predict mortality in older people?

Area of Science:

• Gerontology
• Psychiatry
• Epidemiology

Background:

• Depressive symptoms are prevalent in older populations.
• These symptoms have been linked to increased mortality risk.

Purpose of the Study:

• To investigate if depressive symptoms predict mortality in older adults.
• To examine the dose-response relationship (gradient) of depressive symptoms and mortality.
• To identify specific depressive factors associated with mortality.

Main Methods:

• 1751 community-dwelling older adults were interviewed using the Center for Epidemiologic Studies - Depression (CES-D) scale.
• Data included demographics, cognitive function, self-rated health, and functional status.
• Cox regression models analyzed the association between depressive symptoms and time to death.

Main Results:

• Individuals with depressive symptoms (CES-D score 16+) showed higher mortality (HR 1.71).
• This association became non-significant after adjusting for self-rated health and functional status.
• A gradient of mortality risk was observed across the range of CES-D scores; somatic, depressed affect, and positive affect factors were significant in bivariate but not multivariable analyses.

Conclusions:

• Depressive symptoms are a significant predictor of mortality in older adults.
• The predictive power of depressive symptoms is influenced by self-rated health and functional status.
• Specific depressive symptom dimensions like somatic complaints and affect may contribute to mortality risk.