Table 3.
Montreal classification by race
| Total populationa | White | Black | Hispanic | Asian | P-valueb | |
|---|---|---|---|---|---|---|
| Crohn’s disease (n = 77) c | ||||||
| Montreal A class, no. (%) | 0.12 | |||||
| A1 | 9 (11.7) | 6 (16.2) | 3 (17.7) | 0 (0) | 0 (0) | |
| A2 | 42 (54.6) | 22 (59.5) | 10 (58.8) | 5 (50.0) | 5 (38.5) | |
| A3 | 26 (33.8) | 9 (24.3) | 4 (23.5) | 5 (50.0) | 8 (61.5) | |
| Montreal L class, no. (%) | 0.30 | |||||
| L1 | 8 (10.4) | 4 (10.8) | 4 (23.5) | 0 (0.0) | 0 (0.0) | |
| L2 | 23 (29.9) | 9 (24.3) | 5 (29.4) | 2 (20.0) | 7 (53.9) | |
| L3 | 43 (55.8) | 22 (59.5) | 7 (41.2) | 8 (80.0) | 6 (46.2) | |
| L4 modifier | 11 (14.9) | 4 (11.4) | 4 (25) | 0 (0.0) | 3 (23.1) | |
| Montreal B class, no. (%) | 0.08 | |||||
| B1 | 53 (68.8) | 23 (62.2) | 12 (70.6) | 8 (80.0) | 10 (76.9) | |
| B2 | 11 (14.3) | 6 (16.2) | 5 (29.4) | 0 (0.0) | 0 (0.0) | |
| B3 | 13 (16.9) | 8 (21.6) | 0 (0.0) | 2 (20.0) | 3 (23.1) | |
| Perianal modifier | 15 (19.5) | 7 (18.9) | 5 (29.4) | 2 (20.0) | 1 (7.7) | |
| Ulcerative colitis (n = 137) d | ||||||
| Montreal E class, no. (%) | 0.14 | |||||
| E1 | 23 (16.8) | 9 (13.6) | 3 (21.4) | 4 (16.0) | 7 (21.9) | |
| E2 | 33 (24.1) | 20 (30.3) | 4 (28.6) | 4 (16.0) | 5 (15.6) | |
| E3 | 81 (59.1) | 37 (56.1) | 7 (50.0) | 17 (68.0) | 20 (62.5) | |
aIncludes three patients with “other” race
b P-values calculated using contingency tables and Pearson’s χ2 or Fisher’s exact test, as appropriate
cMontreal L and B classes exclude the three patients with undocumented Montreal classification (n = 74 for these classes); A class was known for all subjects (n = 77)
dExcludes 13 patients with undocumented disease extent