OBJECTIVE: To investigate the pan-European, cross-cultural validity of the EuroQol-5D (EQ-5D) for assessing quality of life in the Schizophrenia Outpatient Health Outcomes (SOHO) Study. METHOD: The EQ-5D items investigated were mobility, self-care, usual activities, pain/discomfort and anxiety/depression. A Rasch rating scale model (a form of differential item functioning) was used to identify invariance of item calibrations for the 10 European countries participating in the SOHO study. RESULTS: There was general congruence in the EQ-5D item calibration pattern. The rank of average EQ-5D item calibrations was similar for all countries except Denmark. Denmark showed slight misfits for mobility and pain/discomfort. CONCLUSION: The EQ-5D is an appropriate measure of health-related quality of life across European countries and translations.
OBJECTIVE: To investigate the pan-European, cross-cultural validity of the EuroQol-5D (EQ-5D) for assessing quality of life in the SchizophreniaOutpatient Health Outcomes (SOHO) Study. METHOD: The EQ-5D items investigated were mobility, self-care, usual activities, pain/discomfort and anxiety/depression. A Rasch rating scale model (a form of differential item functioning) was used to identify invariance of item calibrations for the 10 European countries participating in the SOHO study. RESULTS: There was general congruence in the EQ-5D item calibration pattern. The rank of average EQ-5D item calibrations was similar for all countries except Denmark. Denmark showed slight misfits for mobility and pain/discomfort. CONCLUSION: The EQ-5D is an appropriate measure of health-related quality of life across European countries and translations.
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