Table 3.
Montreal Classification of Inflammatory Bowel Disease Patients in São Paulo City, Brazil
| Montreal Classification | CD (n=303) | UC (n=355) | |
|---|---|---|---|
| Age at diagnosis (A) | A1 (≤16 years old) | 35 (11.6) | 34 (9.6) |
| A2 (17–40 years old) | 185 (61.1) * | 197 (55.5) * | |
| A3 (>40 years old) | 83 (27.4) | 124 (34.9) | |
| Disease location (L) | L1 (terminal ileum) | 63 (20.8) | – |
| L2 (colon) | 59 (19.5) | – | |
| L3 (ileocolon) | 145 (47.9)* | – | |
| L4 (upper GI) | 20 (6.6) | – | |
| L1, L2 or L3 + L4 | 16 (5.3) | ||
| Disease extent (E) | E1 (proctitis) | – | 42 (11.8) |
| E2 (left-sided colitis) | - | 134 (37.8) | |
| E3 (extensive colitis) | - | 179 (50.4) * | |
| Disease behavior (B) | B1 (nonstricturing, nonpenetrating) | 90 (29.7) * | - |
| B1p (perianal disease modifier) | 37 (12.2) | - | |
| B2 (stricturing) | 66 (21.8) | - | |
| B2p (perianal disease modifier) | 27 (8.9) | - | |
| B3 (penetrating) | 56 (18.5) | - | |
| B3p (perianal disease modifier) | 27 (8.9) | - | |
Notes: Test of equal proportions for each group and disease; *p < 0.05 = statistical significance.
Abbreviations: CD, Crohn’s disease; UC, ulcerative colitis; GI, gastrointestinal tract.