Performance of the Montreal classification for inflammatory bowel diseases

Table 1 Montreal classification of Crohn’s disease, ulcerative colitis, non-classified chronic colitis and indeterminate colitis

Diagnosis (20 case-vignettes)
Crohn’s Disease (CD)
Ulcerative Colitis(UC)
Non-classified chronic colitis (IBD-U)
Indeterminate colitis (IBD-I)
Age of onset (A) (20 case-vignettes)
A1: 16 yr or younger
A2: 17-40 yr
A3: over 40 yr
CD (10 case-vignettes)	UC, IBD-U, IBD-I (10 case-vignettes)
Localization (L)	Disease extent (E)
L1: Terminal ileum	E1: Proctitis
L2: Colon	E2: Left-sided UC; proximal extent of inflammation is distal to the rectosigmoid
L3: Ileocolon
L4: Upper gastrointestinal	E3: Extensive UC; involvement extends proximal to the splenic flexure.
P: Perianal disease
Behavior (B)	Disease severity (S)
B1: Nonstricturing, nonpenetrating B2: Stricturing B3: Penetrating	S0: Remission, no symptoms S1: Mild, ≤ 4 ×/d stools, no systemic signs of toxicity, normal ESR S2: Moderate, > 4 ×/d stools, minimal systemic signs of toxicity S3: Severe, ≥ 6 ×/d stools, pulse > 90 beats/min, temperature > 37.5, Hemoglobin < 6.5 mmol/L, ESR > 30 mm

EIM: Extra-intestinal manifestations; ESR: Erythrocyte sedimentation rate.