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Using the SF-36 and Euroqol on an elderly population
J E Brazier1, S J Walters, J P Nicholl
1Sheffield Centre For Health and Related Research, University of Sheffield, UK.
Summary
This study evaluated the SF-36 and Euroqol health instruments for elderly women, finding SF-36 offers greater sensitivity but has lower completion rates and consistency issues compared to Euroqol and OPCS Disability Survey.
Area of Science:
- Gerontology
- Health Services Research
- Psychometrics
Background:
- Measuring health-related quality of life (HRQoL) in elderly populations presents methodological challenges.
- Generic HRQoL instruments require validation for specific demographic groups, particularly older adults.
Purpose of the Study:
- To assess the completion rates, reliability, and validity of the UK SF-36 and Euroqol (EQ) instruments in elderly women (aged 75+).
- To compare these instruments against the OPCS Disability Survey for this population.
Main Methods:
- A randomized controlled trial sample of 380 women aged 75+ completed the UK SF-36, Euroqol, and OPCS Disability Survey at baseline.
- A subsample underwent retesting at six months to evaluate test-retest reliability.
- Construct validity was assessed against age and healthcare utilization.
Main Results:
- SF-36 had lower completion rates (68.1%-88.9%) than Euroqol (84%-93.5%) and OPCS (99.2%).
- Test-retest correlations were significant for all, but lower for SF-36's role and social functioning dimensions.
- SF-36 showed potential for greater sensitivity to lower morbidity levels, while Euroqol is suitable for brevity and substantial health changes.
Conclusions:
- SF-36 demonstrates higher sensitivity for detecting subtle health changes in elderly women but requires adaptation due to lower completion and consistency issues.
- Interviewer administration or modifications to the SF-36 may improve its utility in this population.
- Euroqol may be sufficient when brevity and detecting significant health changes are priorities.