Validity and reliability of the Persian version of the comprehensive constipation questionnaire

Abstract

Background: Chronic constipation is one of the most common complaints of patients in developed countries, which affects 2 to 28% of the world's population and alter patients' quality of life extensively. Other questionnaires do not provide a complete tool that can assess different aspects of the disease, so the purpose of this study was to determine the validity and reliability of the comprehensive constipation questionnaire in Persian. Methods: The original version of the Comprehensive Constipation Questionnaire was translated into Persian by a fluent English translator using the Forward-Backward method. after evaluating the content validity ratio index (CVR) based on the Lawshe table (CVR≥ 0.62) and the content validity index (CVI> 0.79) were confirmed. The internal reliability of the questionnaire was assessed by Cronbach's alpha and the reliability of the test-retest was assessed using the in-class correlation coefficient (ICC). Structural validity of the questionnaire was obtained using exploratory factor analysis. Results: Content validity was confirmed in the range of 0.84 to 1.00, And Cronbach's alpha values in the range of 0.90-1.00 were acceptable) In this questionnaire, ICC in the range of 0.76-0.99 was used, which indicates a level of good to excellent reliability of the questionnaire. Also, the results of the factor analysis was confirmed at a moderate level Kaiser Meyer Olkin test (KMO> 0.6 and Bartlett test P <0.05) by extracting 1 factor solution. Conclusion: The Persian version of the comprehensive constipation questionnaire had an acceptable validity and reliability and seems to be an effective tool to evaluate patients with constipation.