ABSTRACT
The purpose of this study was to determine reliability and construct validity of a Persian version of the Gastrointestitnal Symptoms Rating Scale [GSRS] in 2 samples of patients with functional gastrointestinal disorders [FGID] and healthy persons. The clinical sample consisted of 143 patients diagnosed with FGID who were referred to the Psychosomatic Disorders Clinic. Controls consisted of 108 healthy individuals [without digestive diagnoses] matched by age, gender marital and educational status. The results of the factor structure or construct validity that used the principal components analysis with varimax rotation was 4 factors of diarrhea, abdominal pain, constipation, and indigestion in patients with FGID, which showed a 61.53 variance. Among the 6 factors of indigestion, abdominal pain, constipation, and its dimensions were satisfactory with Cronbach-Alpha. The Persian version of the GSRS has favorable reliability and validity