| Age at diagnosis |
A1: below 16 years
A2: 17-40 years
A3: above 40 years |
| Location |
L1: terminal ileal (limited cecal disease)
L2: colonic
L3: Ileocolonic
L4: isolated upper disease |
| Behavior |
B1: non-stricturing non penetrating
B2: structuring
B3: penetrating
p: perianal disease |
|