Quality of Life and Health-Related Quality of Life over 1 Year in Older Women: Monitoring Stability and Reliability of Measurement

Yvonne C. Learmonth, Elizabeth A. Alwick, Edward McAuley, Robert W. Motl

Research output: Contribution to journalArticle

Abstract

Assessing quality of life (QOL) and health-related quality of life (HRQOL) in older adults is important. Yet, limited research is available on the stability of these constructs and the psychometric properties of QOL [e.g., Satisfaction with Life Scale (SWLS)] and HRQOL [e.g., Short-Form 12 Health Survey (SF-12)] measures in this population. Such knowledge is important for designing and interpreting interventions. We examined stability of QOL (SWLS) and HRQOL (SF-12) and their test–retest reliability, measurement error, and interpretability over 1 year in older Black and White women (n = 230). Stability and reliability were ascertained through paired sample t tests and intraclass correlation coefficients (ICCs). Standard error of measurement and coefficient of variation assessed measurement error. Smallest detectable change estimated score interpretability. QOL and HRQOL remained stable; ICC values indicated moderate reliability for the SWLS and SF-12 (SWLS = 0.73, SF-12 Physical Composite Summary = 0.69, SF-12 Mental Composite Summary = 0.58). Measurement error and interpretability estimates were similar for both the SWLS and SF-12. Interpretability estimates indicated a change in score of around 33 % may represent an important change. We provide novel data for selecting and interpreting QOL and HRQOL measures contributing to a better understanding of intervention efficacy.

Original languageEnglish (US)
Pages (from-to)267-279
Number of pages13
JournalSocial Indicators Research
Volume123
Issue number1
DOIs
StatePublished - Aug 22 2015

Keywords

  • Clinical research
  • Gerontology
  • Measurement

ASJC Scopus subject areas

  • Social Sciences(all)
  • Sociology and Political Science
  • Arts and Humanities (miscellaneous)
  • Developmental and Educational Psychology

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