Cross-cultural adaptation, the validity, and reliability of the Wexner questionnaire in patients with functional constipation in an Iranian population
Gastroenterology and Hepatology from Bed to Bench,
26 April 2021
Aim: The present study aimed to cross-culturally adapt and assess the validity and reliability of the English version of the Wexner questionnaire into the Persian language in Iranian patients.
Background: Constipation is one of the most common gastrointestinal disorder; therefore, it is necessary to utilize an index, both for the clinic and research studies.
Materials and methods: In the first phase, The English version of the Wexner questionnaire was translated into the Persian language. In the second phase, it was assessed for the evaluation of psychometric properties in 136 patients with functional constipation who refer to Gastrointestinal and Physical Medicine Clinics. Content validity was assessed by face validity. Construct validity was tested based on hypothesis testing and structural validity. Correlation of the total score of the Wexner questionnaire and Patient Assessment Constipation Quality Of Life (PAC-QOL) questionnaire was used for concurrent criterion validity. Internal consistency and test-retest reliability were calculated using Cronbach's α and intraclass correlation coefficient (ICC). Also, the floor/ceiling effect of the questionnaire was evaluated.
Results: The content validity was acceptable. The construct and concurrent criterion validity showed moderate correlation. The internal consistency and Intrarater reliability were moderate (0.51) and excellent (rp = 0.97, P-value<0.001), respectively. No floor/ceiling effect was seen.
Conclusion: The Persian version of the Wexner questionnaire showed good validity and reliability in Iranian patients and therefore could be applied in clinics as well as in research for Persian-speaking countries.
Keywords: Constipation, Validity, Reliability, Persian, Questionnaire
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