Psychometric properties of Japanese version of the Recovering Quality of Life (ReQoL)

This study aims to examine the psychometric properties of the Recovering Quality of Life- Japanese version (ReQoL-J) for use in the community setting.

This cross-sectional study was conducted among service users of community mental health service facilities. A series of confirmatory factor analyses (CFAs) was performed. After the best-fitting model was identified, omega indices, and intraclass correlation (ICC) were calculated to evaluate dimensionality and reliability. The correlation coefficients between the ReQoL-J scores and the other scales were calculated for testing construct validity. We also estimated the correlation coefficients between the ReQoL-J-10 and - 20.

A total of 395 service users from 23 facilities in Japan participated in this study. Of these, 66 responded to the test-retest reliability. The bifactor model showed the best fit to the data: χ²/df = 1.74, CFI = 0.993, RMSEA = 0.031, and SRMR = 0.038. ECV and OmegaH indicated unidimensionality. ICC for the Re-QoL-J-10 and - 20 were 0.700 and 0.766, respectively. The ReQoL-J-10 showed a high correlation with the ReQoL-J-20 (r =.95, p <.001). The EQ-5D-5 L, a new brief scale for subjective personal agency (SPA-5), well-being and the quality of life scale (QLS) scores were positively correlated with the ReQoL-J score. On the other hand, the patient health questionnaire-9 (PHQ-9) and the WHODAS scores were negatively correlated with the ReQoL-J score.

Factor structure, internal consistency, test-retest reliability, and construct validity of the ReQoL-J were confirmed. The ReQoL-J is a promising tool as a patient-reported outcome measure in mental health services for the Japanese community setting.