Figure 1
From: Risk of inflammatory bowel disease following a diagnosis of irritable bowel syndrome
Flow diagram of study population. IBS: irritable bowel syndrome; IBD: inflammatory bowel disease; CD: Crohn’s disease; UC: ulcerative colitis; IC: indeterminate colitis. * Well-defined IBS: initial IBS diagnosis, a subsequent medical encounter (≤12 months) with sigmoidoscopy and/or diagnostic colonoscopy and a subsequent medical encounter (≤ 12 months) with an additional ICD-9 code of IBS with no IBD medical encounters.