Development of the Japanese version of the Westmead Home Safety Assessment for the elderly in Japan

OBJECTIVE: Home safety assessment and intervention is a key component in the management of fall risk in elderly people. However, a standardised assessment for home safety has not yet been established in Japan. We developed a Japanese version of the Westmead Home Safety Assessment by partially modifying the original version according to house structures and lifestyles in Japan and examined its inter-rater reliability and content validity. METHODS: Japanese elderly in the community who had fear of falls were recruited to investigate the reliability of the Japanese version of the Westmead Home Safety Assessment. Two occupational therapists simultaneously visited a participant’s home to perform the Japanese version of the Westmead Home Safety Assessment independently. Further, an expert panel of 18 occupational therapists evaluated the relevance of each item of the Japanese version of the Westmead Home Safety Assessment. RESULTS: Fifty elderly people (aged 78.2 ± 7.1 years) participated in this reliability study. The most frequent hazards were identified as internal steps/stairs, seating, bathroom, bath, and external steps/stairs. Forty-nine items (69%) in the Japanese version of the Westmead Home Safety Assessment were rated to have fair to good (0.40 < κ < 0.75) or excellent (κ ≥ 0.75) reliability as well as excellent validity (item content validity ≥0.78). These items were concerned with basic activities of daily living and some simple instrumental activities of daily living. The scale content validity was 0.78 ± 0.16 but was not excellent (scale content validity index <0.90). CONCLUSIONS: This study suggested that 49 items in the Japanese version of the Westmead Home Safety Assessment were appropriate for home safety assessment for Japanese elderly. Further research is necessary to improve the reliability and validity of the present version of the Japanese version of the Westmead Home Safety Assessment for this population.