Table 1.
Baseline characteristics at the initial visit.
| Demographics/characteristics | Any (n = 1401) |
|---|---|
| Gender, male (n [%]) | 762 (54.4) |
| Age at the time of the first consultation, years | |
| Mean (SD) | 39.8 (17.3) |
| Median (range) | 38.0 (0–93) |
| Percentile (25%) | 26 |
| Percentile (50%) | 38 |
| Percentile (75%) | 52 |
| Age at the time of the initial diagnosis, years | |
| Mean (SD) | 35.0 (16.7) |
| Median (range) | 31.5 (0–93) |
| Percentile (25%) | 22 |
| Percentile (50%) | 31.5 |
| Percentile (75%) | 46 |
| Height, cm, median (SD) | 162.9 (9.7) |
| Body weight, kg, median (SD) | 57.0 (12.0) |
| Body mass index, median (SD) | 19.0 (7.6) |
| Smoking | |
| None (n [%]) | 676 (48.3) |
| Previous smoker (n [%]) | 186 (13.3) |
| Current smoker (n [%]) | 80 (5.7) |
| Unknown (n [%]) | 459 (32.8) |
| Prior history of appendectomy (n [%]) | 24 (1.7) |
| Initial diagnosis of UC at the time of first consultation (n [%]) | 419 (29.9) |
| Partial Mayo grade at the time of the first consultation | |
| Inactive (n [%]) | 475 (33.9) |
| Mild (n [%]) | 451 (32.2) |
| Moderate (n [%]) | 329 (23.5) |
| Severe (n [%]) | 146 (10.4) |
| Type of UC at the time of the first consultation | |
| Proctitis (n [%]) | 367 (26.2) |
| Left-sided colitis (n [%]) | 368 (26.3) |
| Pancolitis (n [%]) | 488 (34.8) |
| Right-sided or segmental colitis (n [%]) | 95 (6.8) |
| Unknown (n [%]) | 83 (5.9) |