This study aimed to authenticate the validity and reliability of the 40-item Japanese version of the Forensic Psychiatric Nursing Competence (FPNC-J) scale. We used the FPNC-J scale and conducted anonymous online surveys with 213 nurses who worked in the forensic psychiatric wards, assessed the internal consistency, test–retest reliability, and structural and convergent validities. The goodness-of-fit indices showed a poor fit. An exploratory factor analysis identified four factors. Cronbach’s a and Intraclass Correlation Coefficient indicated moderately good reliability. This suggests that the FPNC-J scale is useful for measuring competence in forensic mental health nursing practice.
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