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The self-administered 24-item geriatric pain measure (GPM-24-SA): psychometric properties in three European populations of community-dwelling older adults.

Research paper by Kerri M KM Clough-Gorr, Eva E Blozik, Gerhard G Gillmann, John C JC Beck, Bruce A BA Ferrell, Jennifer J Anders, Danielle D Harari, Andreas E AE Stuck

Indexed on: 26 Sep '08Published on: 26 Sep '08Published in: Pain Medicine



Abstract

To explore the feasibility and psychometric properties of a self-administered version of the 24-item Geriatric Pain Measure (GPM-24-SA).Secondary analysis of baseline data from the Prevention in Older People-Assessment in Generalists' practices trial, an international multi-center study of a health-risk appraisal system.One thousand seventy-two community dwelling nondisabled older adults self-reporting pain from London, UK; Hamburg, Germany; and Solothurn, Switzerland.GPM-24-SA as part of a multidimensional Health Risk Appraisal Questionnaire including self-reported demographic and health-related information.Among the 1,072 subjects, 655 had complete GPM-24-SA data, 404 had <or=30% missing GPM-24-SA data, and 13 had >30% missing GPM-24-SA data. In psychometric analyses across the three European populations with complete GPM-24-SA data, the measure exhibited stable internal consistency, good convergent, divergent and discriminant validity, and produced stable pain measurements. However, factor analysis indicated differences in the GPM-24-SA across sites with discrepancies mainly related to items of a single subscale that failed to load appropriately. Analyses including imputation for subjects with <or=30% missing data demonstrated psychometric properties comparable to complete data analyses suggesting that imputation in cases with <or=30% missing GPM-24-SA data provides sufficient information to generate a valid score.The GPM-24-SA is a promising tool for self-administered assessment of pain in community dwelling older adults. However, because of incomplete response and uncertainty in factor structure, further refinement and psychometric evaluation of the GPM-24-SA is needed before it could be recommended for widespread use.