Objective： To test the equivalence of WHOQOL-BREF among 13 country versions. Methods： Multi-group confirmatory factor analysis was used to examine the equivalence of WHOQOL-BREF across 13 centers. The data used to test the equivalence of WHOQOL-BREF was collected by 13 centers in their own studies. Results： All of the Cronbach alpha values for the domains of physical, psychological, and environmental in each center were above 0.7, ranging from 0. 7 to 0. 88. Most of the Cronbach alpha values for the social relationship domain were above 0. 65 except that of the United Kingdom and Norway centers, which were 0. 39 and 0. 51 respectively. A four-domain structure was constructed according to the WHOQOL publications. The model was fitted for the 13 centers＇data, respectively. The CFI （the comparative fit index） was well above 0. 8. Germany, Spain and United States were the centers where, the CFI was above 0.9. Multi-sample analyses were then carried out. The CFI was 0. 88 and the results indicated that not all the corresponding loadings were equal across the 13 centers but the differences were small and the factor loadings＇profiles were similar. Conclusions： WHOQOL-BREF is equivalent across the 13 different centers and the outcome assessed by it is comparable.
Chinese Mental Health Journal