Table 1.
Baseline Characteristics at Diagnosis and Surgery
| Variable | Diagnosis (n=292) | Surgery (n=292) |
|---|---|---|
| Sex | ||
| Male | 198 (67.8) | 198 (67.8) |
| Female | 94 (32.2) | 94 (32.2) |
| Age, yr | 25.6 (17.0–32.0) | 29.6 (21.0–35.8) |
| A1 (16) | 63 (21.6) | 34 (11.6) |
| A2 (17–40) | 196 (67.1) | 207 (70.9) |
| A3 (>40) | 33 (11.3) | 51 (17.5) |
| Location | ||
| L1 (ileal) | 116 (39.7) | 155 (53.1) |
| L2 (colonic) | 37 (12.7) | 41 (14.0) |
| L3 (ileocolonic) | 135 (46.2) | 92 (31.5) |
| L4 (isolated upper disease) | 4 (1.4) | 4 (1.4) |
| Behavior | ||
| B1 (non-stricturing, non-penetrating) | 130 (44.5) | 42 (14.4) |
| B2 (stricturing)* | 102 (34.9) | 86 (29.5) |
| B3 (penetrating)† | 70 (24.0) | 194 (66.4) |
| P (perianal disease) | 115 (39.4) | 135 (46.2) |
| Current smoking | ||
| Current smoker | 51 (17.5) | 40 (13.7) |
| Ex-smoker + non-smoker | 241 (82.5) | 252 (86.3) |
| CD diagnosed after surgery | 49 (16.8) | - |
| Family history of IBD | 8 (2.7) | - |
Data are presented as number (%) or median (range).
CD, Crohn’s disease; IBD, inflammatory bowel disease.
*
Stricturing behavior, including the B2 (stricturing) and B2+B3 (stricturing and penetrating) phenotypes; †Penetrating behavior, including the B3 (penetrating) and B2+B3 (stricturing and penetrating) phenotypes.