
Original ResearchItem-Level Assessment of the Irritable Bowel Syndrome Quality of Life Questionnaire in Patients With Diarrheal Irritable Bowel Syndrome
Keywords: کارکرد دیفرانسیلی; diarrhea; differential item functioning; graded response model; IBS-QOL; irritable bowel syndrome; item response theory; patient-reported outcomes; psychometrics; quality of life;