The World Health Organization Quality of Life (WHOQOL)-BREF
To evaluate the criterion validity of the Chinese version of the Scales, we used the Chinese version of the WHOQOL-BREF developed the WHO’s WHOQOL group, which contains 26 items. Questionnaires with over 20% of missing data should be discarded. Missing values are replaced by the average domain value. If there are more than 2 missing values in a domain, the domain score is not calculated (except for domain 3, whose score is only calculated if the missing value <1). The Cronbach’s α value of the internal consistency of the overall questionnaire is .90, and the test-retest reliability of each category reaches .75 or above. For the Pearson correlation, the correlation between each item and its category ranges from .45 to .82 (p< .01), and the correlation between different categories ranges from .48 to .63 (p <.01). For the confirmatory factor analysis (CFA) of the construct validity, the structural equation model of the 4 factors echoes the potential structure designed by the questionnaire, and the comparative fitness indices (CFI) of these 2 analyses are all .886, which is equivalent to that of the Hong Kong version of the questionnaire (CFI = .894) and similar to that of the questionnaire using global data (CFI = .903).21