Table 3. Composition of Korean pediatric Crohn's disease phenotype at diagnosis according to the Paris classification.
| Location and behavior | Total (p) | Age | ||||
|---|---|---|---|---|---|---|
| LGI | UGI | B | A1a (p) | A1b (p) | A2 (p) | |
| L4b | B1 | 2 (0) | 2 (0) | |||
| L1 | B1 | 12 (6) | 8 (4) | 4 (2) | ||
| L1 | L4a | B1 | 5 (1) | 5 (1) | ||
| L1 | L4b | B1 | 8 (2) | 7 (2) | 1 (0) | |
| L1 | B2 | 2 (1) | 2 (1) | |||
| L1 | L4b | B2 | 4 (2) | 2 (0) | 2 (2) | |
| L1 | L4ab | B2 | 1 (0) | 1 (0) | ||
| L1 | B2B3 | 1 (0) | 1 (0) | |||
| L1 | L4b | B3 | 1 (0) | 1 (0) | ||
| L2 | B1 | 14 (6) | 4 (2) | 9 (4) | 1 (0) | |
| L2 | L4a | B1 | 6 (2) | 1 (0) | 3 (1) | 2 (1) |
| L2 | L4b | B1 | 1 (1) | 1 (1) | ||
| L2 | L4ab | B1 | 2 (0) | 2 (0) | ||
| L2 | B2 | 1 (1) | 1 (1) | |||
| L2 | L4b | B2 | 1 (1) | 1 (1) | ||
| L3 | B1 | 60 (25) | 8 (4) | 41 (16) | 11 (5) | |
| L3 | L4a | B1 | 47 (30) | 43 (29) | 4 (1) | |
| L3 | L4b | B1 | 29 (9) | 26 (8) | 3 (1) | |
| L3 | L4ab | B1 | 21 (11) | 2 (1) | 19 (10) | |
| L3 | B2 | 6 (2) | 4 (0) | 2 (2) | ||
| L3 | L4a | B2 | 4 (2) | 4 (2) | ||
| L3 | L4ab | B2 | 1 (1) | 1 (1) | ||
| L3 | L4b | B2 | 7 (3) | 6 (2) | 1 (1) | |
| L3 | B2B3 | 1 (0) | 1 (0) | |||
| L3 | L4ab | B2B3 | 1 (1) | 1 (1) | ||
| L3 | B3 | 1 (1) | 1 (1) | |||
| L3 | L4ab | B3 | 1 (1) | 1 (1) | ||
| Total | 241 (108) | 17 (7) | 192 (86) | 32 (15) | ||
LGI: lower gastrointestinal, UGI: upper gastrointestinal, B: behavior, p: perianal fistulizing disease, A1a: 0–9 years, A1b: 10–16 years, A2: ≥17 years, L1: distal 1/3 ileum±limited cecal disease, L2: colonic disease, L3: ileocolonic disease, L4a: upper disease proximal to the ligament of Treitz, L4b: upper disease distal to the ligament of Treitz and proximal to the distal 1/3 ileum, L4ab: upper disease involvement in both L4a and L4b, B1: nonstricturing nonpenetrating behavior, B2: stricturing behavior, B3: penetrating behavior, B2B3: both B2 and B3.