Table 1.
Characteristics of Crohn's disease patients and healthy controls in a Chinese Han population
| Characteristics | CD patients | Control subjects |
| Number | 312 | 479 |
| Male/female | 205/107 | 308/171 |
| Age, mean ± SD (yr) | 34.0 ± 13.0 | 36.5 ± 15.1 |
| Age at diagnosis (ys) | ||
| < 17 | 42 | 63 |
| 17-40 | 212 | 324 |
| > 40 | 58 | 92 |
| CD behavior | ||
| Inflammatory | 179 | |
| Stricturing | 90 | |
| Penetrating | 43 | |
| CD location | ||
| Ileum | 194 | |
| Colon | 27 | |
| Ileocolon | 91 | |
| Perianal lesions | ||
| Yes | 92 | |
| No | 220 | |
| Appendectomy | ||
| Yes | 18 | |
| No | 294 | |
| Abdominal operation | ||
| Yes | 72 | |
| No | 240 |
CD: Crohn's disease.