Clinical and demographic characteristics of the study population
| Ulcerative colitis (n=341) | Crohn's disease (n=160) | p Value | |
| Age at 10-year follow-up | |||
| Median (range) | 45.6 (22.2 to 76.8) | 38.1 (19.1 to 74.6) | <0.001 |
| Gender | |||
| Female n (%) | 172 (50.4%) | 79 (49.4%) | NS |
| Disease duration, months | |||
| Median (range) | 124 (107 to 165) | 122 (108 to 148) | 0.024 |
| Education at diagnosis | |||
| ≤12 years | 155 (50.5%) | 87 (59.6%) | NS |
| >12 years | 152 (49.5%) | 59 (40.4%) | |
| Missing=34 | Missing=14 | ||
| Smoking at diagnosis | |||
| Yes | 44 (12.9%) | 70 (44.3%) | <0.001 |
| Missing=2 | Missing=2 | ||
| Disease localisation at diagnosis | |||
| Proctitis | 121 (35.5%) | ||
| Left sided | 118 (34.6%) | ||
| Extensive | 102 (29.9%) | ||
| L1, ileal | 45 (28.1%) | ||
| L2, colonic | 70 (43.8%) | ||
| L3, ileocolonic | 41 (25.6%) | ||
| L4, upper | 4 (2.5%) | ||
| Disease behaviour at diagnosis | |||
| B1, non-stricturing/penetrating | 97 (60.6%) | ||
| B2, stricturing | 45 (28.1%) | ||
| B3, penetrating | 18 (11.3%) | ||
| Disability | |||
| No | 269 (78.9%) | 115 (71.9%) | NS |
| Because of IBD | 32 (9.4%) | 25 (15.6%) | 0.040 |
| Other causes | 31 (9.1%) | 6 (3.8%) | 0.032 |
| Rehabilitation | 9 (2.6%) | 14 (8.8%) | 0.002 |
Age and disease duration data were compared using the Mann-Whitney Wilcoxen test. All categorical data were analysed with the χ2 test.
IBD, inflammatory bowel disease; NS, not significant that is, p>0.05.
L1 to L4 and B1 to B3, disease classification according to the Vienna classification system.