Age and sex distributions of the cases and controls
| Patients with ulcerative colitis n (%) | Patients with Crohn's disease n (%) | Controls n (%) | |
|---|---|---|---|
| Total | 7273 (100) | 5023 (100) | 749322 (100) |
| Sex | |||
| Male | 3533 (49) | 2034 (40) | 361632 (48) |
| Female | 3740 (51) | 2989 (60) | 387690 (52) |
| Age (y) | |||
| <20 | 326 (4) | 445 (9) | 189648 (25) |
| 20–49 | 3474 (48) | 2842 (57) | 331198 (44) |
| 50+ | 3473 (48) | 1736 (34) | 228476 (31) |