Table 2.
Baseline characteristics and comparison between the derivation and the validation cohorts of ulcerative colitis patients
| Derivation (n = 1,210) | Validation (n = 271) | Pa | |
| Age at diagnosis, yr, n (%) | 0.064 | ||
| <18 | 104 (9) | 10 (4) | |
| 18–30 | 380 (31) | 86 (32) | |
| 31–50 | 495 (41) | 119 (44) | |
| 51–60 | 139 (11) | 38 (14) | |
| >60 | 92 (8) | 18 (6) | |
| Gender, n (%) | 0.436 | ||
| Female | 670 (55) | 143 (53) | |
| Male | 540 (45) | 128 (47) | |
| Disease extension, n (%) | 0.351 | ||
| E1 | 498 (41) | 120 (44) | |
| E2 | 270 (22) | 50 (19) | |
| E3 | 436 (36) | 100 (37) | |
| Progressive disease, n (%) | 445 (37) | 93 (34) | 0.447 |
| Follow-up, median (IQR), yr | 12 (7–19) | 12 (7–19) | 0.505b |
E1, ulcerative proctitis; E2, left side colitis; E3, extensive ulcerative colitis; IQR, interquartile range; n, number of patients.
a
P values are for the χ2 test unless otherwise indicated.
b
P values are for Mann-Whitney test.