OBJECTIVES: The EQ-HWB is being developed as a separate instrument to assess various impacts on the health and wellbeing of care recipients and caregivers. It is currently being translated into multiple languages, each validated for validity and reliability. This study aimed to verify the reliability and validity of the Japanese version of the EQ-HWB.

METHODS: We simultaneously measured the EQ-5D-5L and EQ-HWB in patients with cerebrovascular disease, Parkinson's disease, cardiac disease, cancer, orthopedic disease, and collagen disease in three hospitals in Japan. Demographic characteristics and ADL data were also included in the study. After examining the data distribution, reliability was tested using the retest method, and validity was examined in terms of correlations and response patterns in each domain.

RESULTS: A total of 274 patients were enrolled in this study. Of these, 42 had stroke, 61 had orthopedic disease, 54 had cardiac disease, 52 had Parkinson's disease, and 45 had connective tissue diseases. Overall, the ceiling effect was identified for vision, hearing, loneliness, and support. On the other hand, the floor effect was identified in meaningful activities [19%], belonging [28%], stigma [20%], satisfaction [13%], and body pain [13%]. Moderate to strong correlations were found between conceptually overlapping dimensions of the EQ-5D-5L and EQ-HWB (e.g., mobility [r=0.612], self-care [r=0.592]). Conversely, no correlations were found between conceptually distinct dimensions (e.g., vision, sleep, belonging, stigma, satisfaction).

CONCLUSIONS: