Research Article
Prior Appendectomy and the Onset and Course of Crohn’s Disease in Chinese Patients
Table 2
Distribution of CD patients according to the Montreal classification.
| | CD () |
| | Age at diagnosis (A) | | A1 (≤16 years) | 54 (8.75%) | | | | A2 (17-40 years) | 393 (63.70%) | | | | A3 (>40 years) | 170 (27.55%) | | | | Location (L) | | Upper GI modifier (L4) | | | L1 (terminal ileum) | 244 (39.55%) | L1+L4 | 12 (1.95%) | | L2 (colon) | 89 (14.42%) | L2+L4 | 1 (0.16%) | | L3 (Ileocolon) | 260 (42.14%) | L3+L4 | 11 (1.78%) | | L4 (upper GI) | 0 | | | | Behavior (B) | | Perianal disease modifier (p) | | | B1 (nonstricturing, nonpenetrating) | 189 (30.63%) | B1p | 59 (9.56%) | | B2 (stricturing) | 211 (34.20%) | B2p | 52 (8.43%) | | B3 (penetrating) | 95 (15.40%) | B3p | 11 (1.78%) |
|
|
