Abstract
This study aimed to conduct item analysis based on item response theory as well as to examine the structural validity of the Occupational Therapist's Professional Identity Measure for Self-Assessment (PI measure). Participants were Registered Occupational Therapists in their first to third year of employment and who worked with the elderly and individuals with physical disabilities. The PI measure was revised by Nakamoto et al., with additions and corrections by the authors. Results revealed that the PI measure had a high measurement accuracy for respondents with average professional identities. The PI measure conformed to the higher-structure model. It fit with the second-order factor model of 29 items that were categorized into four factors;it is possible to use the PI measure for Registered Occupational Therapists who work with people with physical disabilities and the elderly.
