Rasch analysis of the WHOQOL-BREF in older adults from Bucaramanga and Manizales
Keywords:
Calidad de vida, Adulto mayor, Estudios de validaciónAbstract
Objective: To evaluate the validity evidences of a unidimensional approach to WHOQOL-BEF in older adults, following Wolfe and Smith methodology for Rasch based analysis. Method: The instrument was applied to a probabilistic sample of 510 older adults from Bucaramanga and Manizales beneficiaries of day care institutions. Category function, item and person fit, differential item functioning, unidimensionality and reliability analyses were performed. Results: The category structure had to be collapsed from five to four choices. All items and a high proportion of older adults showed adequate adjustment to the Rasch model. Differential item functioning was identified in nine items, although their impact on overall measure was low. Internal consistency was 0.92 and item reliability 0.98. Wright’s map is presented. Conclusions: A unidimensional, interval-scale measure of quality of life can be obtained from the WHOQOL-BREF for older adults. Differential item functioning per sociodemographic characteristics and the possibility of international comparisons should be further researched.
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