Life-Space Mobility Change Predicts 6-Month Mortality

Richard E. Kennedy*, Patricia Sawyer, Courtney P. Williams, Alexander X. Lo, Christine S. Ritchie, David L. Roth, Richard M. Allman, Cynthia J. Brown

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Objectives: To examine 6-month change in life-space mobility as a predictor of subsequent 6-month mortality in community-dwelling older adults. Design: Prospective cohort study. Setting: Community-dwelling older adults from five Alabama counties in the University of Alabama at Birmingham (UAB) Study of Aging. Participants: A random sample of 1,000 Medicare beneficiaries, stratified according to sex, race, and rural or urban residence, recruited between November 1999 and February 2001, followed by a telephone interview every 6 months for the subsequent 8.5 years. Measurements: Mortality data were determined from informant contacts and confirmed using the National Death Index and Social Security Death Index. Life-space was measured at each interview using the UAB Life-Space Assessment, a validated instrument for assessing community mobility. Eleven thousand eight hundred seventeen 6-month life-space change scores were calculated over 8.5 years of follow-up. Generalized linear mixed models were used to test predictors of mortality at subsequent 6-month intervals. Results: Three hundred fifty-four deaths occurred within 6 months of two sequential life-space assessments. Controlling for age, sex, race, rural or urban residence, and comorbidity, life-space score and life-space decline over the preceding 6-month interval predicted mortality. A 10-point decrease in life-space resulted in a 72% increase in odds of dying over the subsequent 6 months (odds ratio = 1.723, P <.001). Conclusions: Life-space score at the beginning of a 6-month interval and change in life-space over 6 months were each associated with significant differences in subsequent 6-month mortality. Life-space assessment may assist clinicians in identifying older adults at risk of short-term mortality.

Original languageEnglish (US)
Pages (from-to)833-838
Number of pages6
JournalJournal of the American Geriatrics Society
Volume65
Issue number4
DOIs
StatePublished - Apr 2017

Keywords

  • comorbidity
  • life space
  • mobility
  • mortality
  • risk assessment

ASJC Scopus subject areas

  • Geriatrics and Gerontology

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    Kennedy, R. E., Sawyer, P., Williams, C. P., Lo, A. X., Ritchie, C. S., Roth, D. L., Allman, R. M., & Brown, C. J. (2017). Life-Space Mobility Change Predicts 6-Month Mortality. Journal of the American Geriatrics Society, 65(4), 833-838. https://doi.org/10.1111/jgs.14738