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