Validation of a revised version of the short-form Mc-Gill pain questionnaire (SF-MPQ-2) for IBS patients.

Background: The aim of this study was the validation of the revised McGill Pain Questionnaire (SF-MPQ-2) in patients with irritable bowel syndrome (IBS). Materials and Methods:  A total of 107 (40 males, 67 females) IBS patients diagnosed according to Rome III criteria who referred to the Gastroenterology Clinic at Baqiyatallah Hospital in 1389 enrolled in this study.  Enrolled patients completed a revised version of the short-form SF-MPQ-2 which had been translated into Farsi. To evaluate the validity of SF-MPQ-2 questionnaire, an exploratory factor analysis was performed. For assessment of reliability, we used Cronbach's alpha coefficient and the split-half method test. Results: Factor analysis denoted a three-factor model that included perceptions of pain sensation, emotional pain and neuropathic pain. The validity of the SF-MPQ-2 was satisfactory according to factor analysis. A comparison between patients with pain and those without pain provided evidence that supported the criterion validity of the questionnaire. Evidence was also adequate to support the content validity of the questionnaire as a measure of pain in IBS patients. The reliability of the scales was also acceptable. Conclusion:    The findings showed acceptable reliability and validity for the revised version of the short-form SF-MPQ-2 in confirming the presence of IBS. Â