Patient characteristics, presenting symptoms and associated risk factors
| Variable | Total (%) |
| Total | 39 (100) |
| Men | 30 (77) |
| Women | 9 (23) |
| Median age at presentation (years) | 42 (IQR) (33–54) |
| Diagnoses | |
| Ulcerative colitis | 37 (95) |
| Familial adenomatous polyposis | 2 (5) |
| Presenting symptoms | |
| Frequency | 26 (70) |
| Abdominal pain | 27 (73) |
| Perianal bleeding | 6 (16) |
| Urgency | 10 (27) |
| Bloating | 6 (16) |
| Incontinence | 9 (24) |
| Perianal discomfort | 7 (19) |
| Median 24-hour stool frequency (range) | 10 (4–25) |
| Risk factors | |
| Smoking | 0 |
| Primary sclerosing cholangitis | 1 (3) |
| Extraintestinal manifestations | 1 (3) |