Aim: The competency model of wound, ostomy, and continence nurses (WOCN) in Japan was developed to promote professional roles and evaluate the process of becoming an expert; however, it has not been verified. This study aimed to verify the competency evaluation index for the WOCN competency model.

Methods: This study was a cross-sectional survey design using self-reported questionnaires. Data were collected using anonymous self-administered questionnaires, distributed to 1,792 WOCNs affiliated with hospitals nationwide; of these, 737 questionnaires were included in the analysis.

Results: Factor analysis showed that the competency evaluation index consisted of 5 concepts: action required for the achievement of duty goals, human relationships based on understanding others, WOCN role formation, WOCN professional skills, and WOCN self-study, each with 2 factors. Reliability was assessed via Cronbach’s α and Spearman-Brown reliability coefficients; content and construct validity were determined via exploratory factor analysis, the known-group technique, and model conformity. Additionally, significant differences in four competency concepts between WOCNs with ≥5 and <5 years’ experience as certified nurses suggested that a 5 years’ experience distinction was an index of enhanced expertise.

Conclusion: The WOCN competency model could be used as an evaluation index to specify the direction of expertise stages.