All patients | Western Europe (n=404, 83%) | Eastern Europe (n=84, 17%) | P value | |
Male, n (%) | 244 (50) | 197 (49) | 47 (56) | 0.23 |
Age at diagnosis, years (IQR) | 33 (23–49) | 34 (24–50) | 30 (23–44) | 0.10 |
Median time to diagnosis, months (IQR, years) | 4 (0–1) | 4 (0–1) | 4 (0–1) | 0.90 |
Extraintestinal manifestations at diagnosis, n (%) | 79 (16) | 63 (16) | 16 (19) | 0.43 |
Smoking status at diagnosis, n (%) | ||||
Never smoker | 183 (40) | 153 (41) | 30 (37) | 0.77 |
Current smoker | 171 (37) | 139 (37) | 32 (39) | |
Former smoker | 103 (23) | 83 (22) | 20 (24) | |
Disease location at diagnosis, n (%) | ||||
L1: Terminal ileum | 128 (27) | 99 (25) | 29 (36) | 0.42 |
L2: Colon | 134 (28) | 115 (29) | 19 (23) | |
L3: Terminal ileum+colon | 111 (23) | 91 (23) | 20 (25) | |
L4: Upper GI | 30 (6) | 28 (7) | 2 (2) | |
L1+L4 | 24 (5) | 20 (5) | 4 (5) | |
L2+L4 | 21 (5) | 19 (5) | 2 (2) | |
L3+L4 | 31 (6) | 25 (6) | 6 (7) | |
Disease behaviour at diagnosis, n (%) | ||||
B1: non-stricturing, non-penetrating | 347 (71) | 286 (71) | 61 (73) | 0.93 0.71 |
B2: stricturing | 100 (21) | 84 (21) | 16 (19) | |
B3: penetrating | 41 (8) | 34 (8) | 7 (8) | |
Perianal disease | 46 (9) | 39 (10) | 7 (8) |
IBD, inflammatory bowel disease.