Baseline patient characteristics (n=582)
| Parameter | Value |
| Age, years, mean (SD) | 52.83 (14.9) |
| Sex, male, n (%) | 179 (32.8) |
| Age at diagnosis of IBD, years, mean (SD) | 35 (17.6) |
| Type of IBD | |
| Crohn’s disease, n (%) | 327 (56.2) |
| Ulcerative colitis, n (%) | 255 (43.8) |
| Operated | 193 (35.0) |
| Crohn’s disease, n (%) | 156 (80.8) |
| Ulcerative colitis, n (%) | 37 (19.2) |
| Time between IBD diagnosis and first surgery, years, mean (SD) | 7 (14.5) |
| Surgery 1, n (%) | 65 (33.7) |
| Surgery 2, n (%) | 41 (21.2) |
| Surgery 3, n (%) | 31 (16.1) |
| Surgery 4, n (%) | 13 (6.7) |
| Surgery 5, n (%) | 6 (3.1) |
| Surgery >5, n (%) | 37 (19.2) |
| First surgery | |
| Previous 0–5 years, n (%) | 30 (16.4) |
| Previous 6–10 years, n (%) | 30 (16.3) |
| Previous 11–15 years, n (%) | 25 (13.6) |
| Previous 16–20 years, n (%) | 22 (15.3) |
| Longer than 20 years, n (%) | 69 (37.9) |
| Medication for IBD, n (%) | 480 (82.5) |
| Biologicals, n (%) | 217 (37.3) |
| Corticosteroids, n (%) | 63 (10.8) |
| Immunosuppressants, n (%) | 171 (29.4) |
| Mesalamines, n (%) | 183 (31.4) |
| Research, n (%) | 7 (1.2) |
| Supportive, n (%) | 51 (8.8) |
| Other, n (%) | 65 (11.2) |
IBD, inflammatory bowel disease.;