Table 2.
Population characteristics and comparison to derivation population
| Derivation set |
Validation set |
p value |
|||
|---|---|---|---|---|---|
| UM (n = 1095) | UM (n = 315) | UPMC (n = 499) | UM vs. derivation | UPMC vs. derivation | |
| Age | 38.2 (±14.6) | 37.7 (±14.2) | 36.1 (±13.1) | 0.63 | <0.01 |
| Female (%) | 573 (52.3) | 161 (51.1) | 245 (49.1) | 0.7 | 0.23 |
| Race | 0.08 | 0.25 | |||
| White | 940 (85.8) | 263 (83.5) | 442 (88.6) | ||
| Black | 129 (11.8) | 37 (11.8) | 50 (10.0) | ||
| Other | 26 (2.4) | 15 (4.8) | 7 (1.4) | ||
| Steroid use | 306 (28.0) | 73 (23.2) | 78 (15.6) | 0.09 | <0.01 |
| Immunomodulator use | 402 (36.7) | 138 (43.8) | 115 (23.1) | 0.02 | <0.01 |
| Biologic use | 232 (21.2) | 103 (32.7) | 155 (31.1) | <0.01 | <0.01 |
| Ciprofloxacin use | 77 (7.0) | 23 (7.3) | 35 (7.0) | 0.87 | 0.99 |
| Metronidazole use | 85 (7.8) | 23 (7.3) | 38 (7.6) | 0.79 | 0.92 |
| Narcotic use | 328 (30.0) | 98 (31.1) | 175 (35.1) | 0.69 | 0.05 |
| 5-ASA use | 413 (37.7) | 67 (21.3) | 70 (14.1) | <0.01 | <0.01 |
| Admission | 974 (89.0) | 288 (91.4) | 386 (77.4) | 0.21 | <0.01 |
UM: University of Michigan; UPMC: University of Pittsburgh Medical Center; 5-ASA: 5-aminosalicylic acid.