Cited by 110Aging, Health, and DisabilityDementia and Cognitive Impairment ResearchHealth disparities and outcomes

The complex relationship between depressive symptoms and functional limitations in community-dwelling older adults: the impact of subthreshold depression

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Hybels, C. F., Pieper, C. F., Blazer, D. G.·2009·Psychological Medicine

Abstract

BACKGROUND: Depressive symptoms above screening thresholds have been shown to predict functional decline in older adults. Less is known about the impact of subthreshold depression, and whether more symptoms confer significantly greater risk compared to fewer symptoms. METHOD: Using data from the Duke Established Populations for Epidemiologic Studies of the Elderly (EPESE) collected over 10 years, we used repeated-measures mixed models to predict functional change by depression status at the prior (index) in-person interview. Depressive symptoms were measured using a modified version of the Center for Epidemiologic Studies Depression Scale (CES-D). Subthreshold depression was operationalized as 6-8 symptoms and CES-D-defined depression as 9-20 symptoms in the previous week. Three domains of functional status were assessed at the subsequent in-person interview: limitations in basic activities of daily living (ADL), instrumental ADL (IADL) and mobility. RESULTS: Controlling for race, sex, age, education, marital status, cognitive status, health status, self-perceived health, perceived social support and functional status at the index interview, having 6 depressive symptoms predicted an increase of 0.12 IADL limitations 3-4 years later (p=0.03). The incremental effect of CES-D-defined depression (9 symptoms compared to 6-8 symptoms) was not significant, suggesting that the effect of more symptomatic depression did not add to that of subthreshold depression. CES-D score modeled as a continuous variable predicted functional change for all domains, but the relationship was not linear, supporting a possible threshold effect. CONCLUSIONS: The relationship between depressive symptoms and functional change is complex, not necessarily linear, and may vary by tasks assessed.

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  1. Duke University Center for the Study of Aging and Human Development Multidimensional Functional Assessment: The OARS Methodology 1978 2nd Edition Durham, NC Duke University

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Authors
Hybels, C. F., Pieper, C. F., & Blazer, D. G.
Affiliations
Duke University (US)
Corresponding author
Hybels, C. F.
Venue
Psychological Medicine
Published
2009-04-09
Volume
39
Issue
10
Pages
1677-1688
ISSN
  • 0033-2917 (ISSN-L)
  • 1469-8978
OpenAlex
W2115937790
Cited by
110
References
54
Citations by year
2026: 9 · 2025: 10 · 2024: 6 · 2023: 4 · 2022: 1 · 2021: 6 · 2020: 6 · 2019: 6 · 2018: 3 · 2017: 6 · 2016: 6 · 2015: 9 · 2014: 9 · 2013: 11 · 2012: 9
FWCI
6.02
Type
journal article
Language
en
Open access
Locations
  • Psychological Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Yale University
  • National Institutes of Health (n01ag012102-011)
  • National Institute on Aging (R01AG012765, R01AG12765, N01‐AG12102, P30AG028716)
  • National Institute of Mental Health (K01MH066380)
  • National Institute on Drug Abuse (R01DA012765)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Aging, Health, and Disability
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Social Sciences › Health › Health disparities and outcomes
Keywords
subthreshold depression, depressive symptoms, functional decline, older adults, instrumental activities of daily living, activities of daily living, mobility (physical function), community-dwelling older adults, CES-D, threshold effects
MeSH terms
Activities of Daily Living, Aged, Cognition, Depression, Female, Health Status, Humans, Longitudinal Studies, Male, Psychiatric Status Rating Scales, Psychological Tests, Regression Analysis, Social Support, Socioeconomic Factors

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