Demographics of endoscopy and MRE cases
| Variable | Endoscopy cases (n=260) | MRE cases (n=105) |
| Female, n (%) | 137 (52.7) | 57 (54.3) |
| Age, mean (SD) | 45.9 (15.3) | 38.4 (15.6) |
| Colonoscopies, n(%) | 220 (84.6) | |
| Flexible sigmoidoscopies, n(%) | 40 (15.4) | |
| Indication, n(%) | ||
| Endoscopy | ||
| Assessment of IBD activity | 108 (41.5) | |
| Assessment of gastrointestinal symptoms | 152 (58.5) | |
| MRE | ||
| Assessment of Crohn’s disease activity | 53 (50.5) | |
| Assessment for small bowel disease (previously not known) | 19 (18.1) | |
| Investigation of gastrointestinal symptoms without previous diagnosis of IBD | 21 (20) | |
| Other | 12 (11.4) | |
| Diagnosis of IBD, n (%) | ||
| None | 152 (58.5) | 32 (30.5) |
| Crohn’s disease | 51 (19.6) | 62 (59) |
| Ulcerative colitis | 54 (20.8) | 8 (7.6) |
| IBD-U | 3 (1.2) | 3 (2.9) |
| Crohn’s disease cases, Montreal classification, n (%) | ||
| Age | ||
| A1 | 9 (17.6) | 12 (19.4) |
| A2 | 37 (72.5) | 44 (71) |
| A3 | 5 (9.8) | 6 (9.7) |
| Behaviour | ||
| Inflammatory | 19 (37.3) | 23 (38.3) |
| Stricturing | 24 (47.1) | 26 (43.3) |
| Penetrating | 8 (15.7) | 10 (16.7) |
| Location | ||
| Ileal | 15 (29.4) | 20 (32.8) |
| Colonic | 11 (21.6) | 7 (11.5) |
| Ileocolonic | 25 (49.0) | 34 (55.7) |
| Perianal disease | 12 (23.5) | 17 (27.4) |
| Upper gastrointestinal disease | 2 (3.9) | 9 (14.5) |
| Ulcerative colitis/IBD-U cases, Montreal disease extent, n (%) | ||
| Proctitis | 9 (15.8) | 2 (18.1) |
| Left-sided | 21 (36.8) | 3 (27.3) |
| Extensive | 26 (45.6) | 6 (54.5) |
| Body mass index, mean (SD) | 26.6 (5.8) | 25.0 (5.6) |
| Obesity, n (%) | 41 (15.8) | 14 (13.3) |
IBD, inflammatory bowel disease; IBD-U, inflammatory bowel disease unclassified; MRE, magnetic resonance enterography.