Development and Validation of a Japanese Version of the Inflammatory Bowel Disease Self-efficacy Scale and Cross-culture Study in Japan and the United States

Background: Self-efficacy is an important health outcome for patients with inflammatory bowel disease (IBD). We aimed to develop a Japanese version of the IBD-Self-Efficacy Scale (IBD-SES.J) and compare characteristics of self-efficacy of IBD patients with previously reported results from patients in the United States. Methods: We conducted a questionnaire survey of patients with IBD from a specialized IBD clinic and respondents recruited online. Self-efficacy of patients in Japan and the United States were compared by Student t test and Cohen d coefficient to gauge effect size. Results: A total of 919 valid responses were obtained: 482 patients from the specialized IBD clinic and 437 patients from the online survey. Significant differences (P <. 01) were observed in the following 3 subscales: "managing stress and emotions,""managing symptoms and disease,"and "maintaining remission"when comparing remission and active periods; and known-group validity was mostly confirmed. Cronbach's alpha coefficients of each subscale ranged between 0.85 and 0.94. Intraclass correlation coefficients (95% confidence intervals [CIs]) to assess test-retest reliability of each item were between 0.56 (95% CI, 0.47-0.64) and 0.78 (95% CI, 0.73-0.82). Self-efficacy scores for most items in Japanese patients with IBD were lower compared with patients in the United States, with moderate effect size (Cohen d>0.5), especially in the subscale "managing stress and emotions."Conclusions: The study demonstrates the reliability and validity of the IBD-SESJ. Self-efficacy scores for most items in Japanese patients were lower than those of patients in the United States. Further investigation is required to understand cross-cultural score differences.