Abstract
BACKGROUND: The ICEpop CAPability measure for Older people (ICECAP-O) and the Adult Social Care Outcomes Toolkit (ASCOT) are preference-based measures for assessing quality of life (QOL) from a broader perspective than do traditional health-related QOL measures such as the EuroQol five-dimensional questionnaire (EQ-5D). Measurement properties of these instruments have not yet been directly compared.
OBJECTIVE: The purpose of this study was to compare the test-retest reliability, construct validity, and responsiveness of the three-level EQ-5D (EQ-5D-3L), ICECAP-O, and ASCOT in frail older adults living at home.
METHODS: Cross-sectional data and longitudinal data were used. Parameters for reliability (the intraclass correlation coefficient) and agreement (standard error of measurement) were used to assess test-retest reliability after 1 week. We formulated hypotheses about correlations with other measures and tested these to assess construct validity and responsiveness (longitudinal validity).
RESULTS: The reliability parameters for all three scales were considered good (intraclass correlation coefficient values above 0.70). Standard error of measurement values were less than 10% of the scale. Hypotheses regarding construct validity were in general accepted; the EQ-5D-3L was more strongly associated with physical limitations than were ICECAP-O and ASCOT and less strongly with instruments measuring aspects beyond health. Longitudinally, as hypothesized, mental health was most strongly associated with ICECAP-O, and self-perceived QOL, mastery, and client-centeredness of home care most strongly with ASCOT.
CONCLUSIONS: Our findings support the adoption of ICECAP-O and ASCOT as outcome measures in economic evaluations of care interventions for older adults that have a broader aim than health-related QOL because they are at least as reliable as the EQ-5D-3L and are associated with aspects of QOL broader than health.
Original language | English |
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Pages (from-to) | 35-43 |
Number of pages | 9 |
Journal | Value in Health |
Volume | 18 |
Issue number | 1 |
Early online date | 11 Nov 2014 |
DOIs | |
Publication status | Published - Jan 2015 |
Keywords
- Activities of Daily Living
- Aged
- Aged, 80 and over
- Cross-Sectional Studies
- Female
- Follow-Up Studies
- Frail Elderly
- Humans
- Longitudinal Studies
- Male
- Netherlands
- Quality of Life
- Reproducibility of Results
- Surveys and Questionnaires
- Comparative Study
- Journal Article
- Randomized Controlled Trial
- Research Support, Non-U.S. Gov't