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Table 3 Percentage of patients with Crohn's disease and ulcerative colitis that reported having had at least one surgery by time since diagnosis

From: A national survey on the patterns of treatment of inflammatory bowel disease in Canada

  Crohn's disease n (%) Ulcerative Colitis n (%)
Years since diagnosis   
0 – 2 6 (22%) 2 (8%)
3 – 5 76 (39%) 11 (9%)
6 – 10 170 (51%) 35 (17%)
11 – 20 398 (65%) 47 (14%)
21 – 30 350 (83%) 31 (19%)
>30 157 (84%) 16 (25%)