Table 5.
Paris Classification and Disease Activity Indices
| Classification | Value |
|---|---|
| Crohn’s disease (n=227) | |
| Age at diagnosis | |
| A1a | 18 (7.9) |
| A1b | 175 (77.1) |
| A2 | 34 (15.0) |
| LGI involvement and location | |
| L1 | 31 (13.7) |
| L2 | 33 (14.5) |
| L3 | 153 (67.4) |
| None | 10 (4.4) |
| UGI involvement and location | |
| L4a | 69 (30.4) |
| L4ab | 37 (16.3) |
| L4b | 62 (27.3) |
| None | 59 (26.0) |
| Luminal disease behavior | |
| B1 | 168 (74.0) |
| B2 | 11 (4.8) |
| B3 | 46 (20.3) |
| B2B3 | 2 (0.9) |
| Perianal disease modifier | |
| No | 119 (52.4) |
| Yes | 108 (47.6) |
| PCDAI | 37.5 (30.0–47.5) |
| Ulcerative colitis (n=80) | |
| Extent | |
| E1 | 22 (27.5) |
| E2 | 9 (11.3) |
| E3 | 6 (7.5) |
| E4 | 43 (53.8) |
| PUCAI | 40 (25–55) |
Data are presented as number (%) or median (interquartile range). The classification in the table is as follows. A1a: age <10 yr, A1b: 10 to <17 yr, A2: age ≥17 yr. L1: distal 1/3 ileum±limited cecal disease, L2: colonic disease, L3: ileocolonic disease, L4a: upper disease proximal to 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: non-stricturing, nonpenetrating behavior, B2: stricturing behavior, B3: penetrating behavior, B2B3: both B2 and B3. E1: ulcerative proctitis, E2: left-sided UC (distal to splenic flexure), E3: extensive (hepatic flexure distally), E4: pancolitis (proximal to hepatic flexure).
UGI, upper gastrointestinal; PCDAI, pediatric Crohn’s disease activity index; PUCAI, pediatric ulcerative colitis activity index.