2024 Volume 20 Issue 1 Pages 111-119
Introduction: The Occupational Self-Assessment Short Form (OSA-SF) Japanese version is a measure of the person's occupational competence and self-perception of value, and is a tool to facilitate client-centered practice. Studies on the OSA-SF Japanese version have been limited and its characteristics have not been examined in healthy adults. The purpose of this study was to evaluate the reliability and validity of the Japanese version of the OSA-SF.
Methods: Participants were recruited through convenience sampling from students affiliated with three occupational therapist training colleges in Japan. Participants were asked to complete the Japanese version of the OSA-SF to assess their self-perception of occupational competence and value. The psychometric properties of the OSA-SF were examined using Rasch analysis (partial credit model).
Results: Responses were received from 302 respondents. Both the Competence and Value scales fit the Rasch model and showed appropriate rating scale functioning, dimensionality, item and person fit, item hierarchies, and item and person reliability. The Value scale tended to be biased toward high person ability and low item difficulty.
Conclusion: The OSA-SF Japanese version was shown to be a reliable and valid instrument for evaluating occupational competence and value in healthy adults. In Japan, the use of OSA-SF is expanding to healthy adults. The short form is expected to be utilized in occupational therapy in the field of prevention and in testing the effectiveness of education for students, since it is shorter and easier to complete.
