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  • Title: Limitations of the SF-36 in a sample of nursing home residents.
    Author: Andresen EM, Gravitt GW, Aydelotte ME, Podgorski CA.
    Journal: Age Ageing; 1999 Oct; 28(6):562-6. PubMed ID: 10604509.
    Abstract:
    OBJECTIVE: to assess test characteristics of the Medical Outcomes Study SF-36 (Short-Form 36) with residents of nursing homes. RESEARCH DESIGN: nursing home residents with 17 or more points on the Mini-Mental State Examination (MMSE) and > or = 3 months residence (128 of 552 screened) were selected randomly. Interviewers administered the SF-36 (repeated after 1 week), Geriatric Depression Scale and MMSE. We recorded activities of daily living and medication data from medical records. Data analysis included test-retest intraclass correlations, item completion, score distributions and SF-36 correlations with measures of physical and mental functioning. RESULTS: 97 nursing home residents (75.8%) consented. Test-retest intraclass correlation coefficients were good to excellent (range = 0.55 to 0.82). Convergent validity between SF-36 physical health scales and the activities of daily living index was modest (r range = -0.37 to -0.43). About 25% of residents scored zero (lowest score) on at least one SF-36 physical function measure. SF-36 mental health scales correlated strongly with the Geriatric Depression Scale (r range = -0.63 to -0.71) and modestly with bodily pain (r = -0.35). No SF-36 scales correlated strongly with the MMSE. CONCLUSION: only one in five nursing home residents met minimal participation criteria, suggesting limited utility of the SF-36 in nursing homes. Reliability and validity characteristics were fairly good. Skewed scores were noted for some SF-36 scales. The utility of the SF-36 may be limited to assessments of subjects with higher cognitive and physical functioning than typical nursing home residents. The SF-36 might benefit from modification for this setting, or by tests of proxy ratings.
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