General characteristics of the inflammatory bowel disease population
| Ulcerative colitis | Crohn’s disease | |
| No of patients | 976 | 483 |
| M:F ratio | 484:492 | 202:281 |
| Median (range) follow up (y) | 10.7 (0.03–64.3) | 10.2 (0.03–57.4) |
| Erythema nodosum | 9 (0.9%) | 27 (5.6%) |
| Uveitis | 30 (3.1%) | 31 (6.4%) |
| Pyoderma gangrenosum | 5 (0.5%) | 6 (1.2%) |