Patient demographics by disease subtype
| Ulcerative colitis (n=1968) | Crohn’s disease (n=1091) | IBDU (n=145) | P value | ||
| Age (median) | 56.5 (42.4–69.5) | 49.9 (35.9–64.7) | 55.1 (40.4–69.2) | <0.001 | |
| Sex | Male | 983 (49.9%) | 505 (46.2%) | 67 (46.2%) | 0.132 |
| Ethnicity | British/white | 1832 (93.1%) | 1020 (93.4%) | 137 (94.5%) | 0.603 |
| Mixed | 9 (0.4%) | 2 (0.2%) | 1 (0.7%) | ||
| Asian | 8 (0.4%) | 4 (0.3%) | 1 (0.7%) | ||
| Not recorded | 119 (6.1%) | 65 (6.0%) | 6 (4.1%) | ||
| Smoking hstory | Never | 830 (42.1%) | 425 (39.0%) | 61 (42.1%) | <0.001 |
| Current | 105 (5.3%) | 188 (17.2%) | 14 (10.1%) | ||
| Ex | 675 (34.3%) | 346 (31.7%) | 45 (31.0%) | ||
| Not recorded | 358 (18.2%) | 132 (12.1%) | 25 (17.2%) | ||
| Socioeconomic decile | 6.0 (5.0–7.0) | 6.0 (4.0–7.0) | 6.0 (4.0–7.0) | 0.957 | |
| Age at diagnosis | 37.8 (27.0–52.5) | 31.0 (22.0–46.8) | 40.8 (29.0–55.1) | <0.001 | |
| Disease duration | 12.0 (6.0–22.0) | 12.0 (5.0–21.2) | 9.0 (5.0–16.0) | 0.014 | |
| Managed by | Primary care | 613 (31.0%) | 226 (20.7%) | 39 (26.9%) | <0.001 |
| Secondary care | 1355 (68.9%) | 865 (79.3%) | 106 (73.1%) |
IBDU, inflammatory bowel disease unclassified.