Table 2 Paris phenotype and disease activity at diagnosis of different age groups
|  | 0–2 y | 3–9 y | 10–16 y | P value |
|---|---|---|---|---|
UC disease extent, n (%) | ||||
 E1 proctitis | 0 (0) | 2 (13.3) | 1 (9.1) | 0.80 |
 E2 left-sided colitis | 1 (25.0) | 5 (33.4) | 3 (27.3) |  |
 E3 extensive colitis | 2 (50.0) | 2 (13.3) | 2 (18.2) |  |
 E4 pancolitis | 1 (25.0) | 6 (40.0) | 5 (45.4) |  |
 severe (PUCAI≥65) | 0 (0) | 3 (20.0) | 3 (27.3) | 0.35 |
CD disease location, n (%) | ||||
 L1: terminal ileum | 2 (6.7) | 4 (12.9) | 12 (23.1) | < 0.01 |
 L2: colonic | 20 (66.6) | 5 (16.1) | 6 (11.5) |  |
 L3: ileocolonic | 8 (26.7) | 22 (71.0) | 33 (63.5) |  |
Upper gastrointestinal, n (%) | ||||
 L4a + b: | 0 | 0 | 7 (13.5) | 0.03 |
 L4a | 4 (13.3) | 8 (25.8) | 13 (25.0) |  |
 L4b | 1 (3.3) | 1 (3.2) | 1 (1.9) |  |
CD disease behaviour, n (%) | ||||
 B1: non-stricturing, non-penetrating | 10 (33.3) | 15 (48.4) | 23 (44.2) | 0.04 |
 B2: stricturing | 13 (43.3) | 8 (25.8) | 27 (51.9) |  |
 B3: penetrating | 5 (16.7) | 7 (22.6) | 1 (1.9) |  |
 B2B3: stricturing and/or penetrating | 2 (6.7) | 1 (3.2) | 1 (1.9) |  |
 P: perianal | 23 (76.7) | 6 (19.4) | 19 (36.5) | < 0.01 |
Disease activity (at the diagnosis) | ||||
 PCDAI (mean ± SD) | 50.9 ± 12.3 | 40.0 ± 11.9 | 35.4 ± 12.4 | < 0.01 |
 PUCAI (mean ± SD) | 31.3 ± 16.5 | 44.0 ± 18.4 | 44.1 ± 20.0 | 0.46 |