title: Translation and validation of the Farsi version of Rome III diagnostic questionnaire for the adult functional gastrointestinal disorders.
abstract: BACKGROUND
  The aim of this study was to validate the Farsi version of Rome III modular questionnaire which contains all functional gastrointestinal disorders (FGIDs).
  
  
  METHODS
  We used Rome foundation guidelines for translation of English version into Farsi, and all the steps were performed. In the first step, 2 forward translations into Farsi were completed by two authors separately, and then translators, who participated in Step 1, together with our monitor, compared the two target-language versions and made some changes. The product of Phase 2 was translated back into English by an American-Iranian physician. The final step was comparison of the two English versions and validation of the translation. In this step, we compared the final version item by item, and also we used focus groups of patients after pretesting.
  
  
  RESULTS
  Our results showed that FGIDs questionnaire diagnosed 153 patients among 169 patients who were diagnosed to have different types of FGIDs. The sensitivity of this questionnaire was 90.5%. It was determined that the odd questions' values of Cronbach's alpha was 0.77 (very reliable), and it was 0.71 (very reliable) in other sections. The split-half test reliability of whole items value was 0.72, which is statistically significant.
  
  
  CONCLUSIONS
  Our findings showed that the Farsi version of Rome III diagnostic questionnaire for the adult functional gastrointestinal disorders demonstrated good validity and reliability and could be used in clinical studies.
authors.affiliation: Social Security Organization, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Toghiani
authors.affiliation: Department of Internal Medicine, Gut and Liver Research Center, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran.
authors.forename: Iradj
authors.initials: I
authors.lastname: Maleki
authors.affiliation: Psychosomatic Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Afshar
authors.affiliation: Medical School, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Amirhossein
authors.initials: A
authors.lastname: Kazemian
keywords: Farsi; Iran; Rome III criteria; functional gastrointestinal disorders; validity