Reliability and validity of the Chinese version of the Chronic Oral Mucosal Diseases Questionnaire

Introduction: The aim of this study was to evaluate the reliability and validity of the Chinese version of the Chronic Oral Mucosal Diseases Questionnaire (COMDQ). Methods: A consecutive sample of 200 patients with chronic oral mucosal diseases was enrolled to complete the questionnaire after its translation and cross-cultural adaptation. The reliability of the Chinese version of COMDQ was determined through internal consistency and testretest methods. The construct validity of COMDQ was analysed by exploratory factor analysis (EFA). Results: Cronbach's alpha value for the total COMDQ score was 0.894, and the testretest intraclass correlation coefficient value for the total COMDQ score was 0.83. The EFA extracted four factors, which accounted for 67.89% of the variance. All items showed adequate factor loadings, ranging from 0.487 to 0.947. Conclusion: The results suggest that the Chinese version of the COMDQ has satisfactory psychometric properties and is applicable to patients with chronic oral mucosal diseases in China. J Oral Pathol Med (2013)42: 194-199