Table 1. Clinical characteristics of the CD patient cohorts.
| Characteristic | Ottawa | Montreal | Winnipeg |
|---|---|---|---|
| N = 93 | N = 193 | N = 164 | |
| Age at diagnosis | |||
| ≤16 | 82 (88.2) | 174 (90.2) | 15 (9.1) |
| >16–40† | 11 (11.8) | 19 (9.8) | 108 (65.9) |
| >40 | 41 (25.0) | ||
| Gender (%) | |||
| Females | 44 (47.3) | 91 (47.2) | 98 (59.8) |
| Males | 49 (52.7) | 102 (52.8) | 66 (40.2) |
| Disease location (%)† | |||
| L1±L4 | 23 (25.3) | 38 (20.1) | 77 (47.2) |
| L2±L4 | 15 (16.5) | 64 (33.9) | 38 (23.3) |
| L3±L4 | 53 (58.2) | 87 (46.0) | 48 (29.4) |
| Disease behaviour (%)† | |||
| B1±p | 71 (76.3) | 172 (90.1) | 87 (53.0) |
| B2±p | 7 (7.5) | 9 (4.7) | 45 (27.4) |
| B3±p | 15 (16.1) | 10 (5.2) | 32 (19.5) |
†Classification based on the WGO’s Montreal Classification. The age at diagnosis cut-off for study inclusion was 16 years in Ottawa and 20 years in Montreal. Four patients had disease restricted to either only the upper tract or anal region and for three patients the location could not be adequately classified. For two patients, the disease behaviour at diagnosis was not clear. The percentages may not add up due to rounding.