Clinical epidemiology of ulcerative colitis in Arabs based on the Montréal classification

Table 2 Patients according to the Montreal classification

Variables	n = 394	95%CI
Age, Montréal classification
A1	7.3%	4.7-9.9
A2	68.4%	63.8-73.0
A3	24.2%	20.0-28.4
Extent, Montréal classification
E1	22.0%	17.4-26.5
E2	35.3 %	30-40.5
E3	42.7 %	37.3-48.5
Severity, Montréal classification
S0	51.4%	46.0-57.0
S1	16.6%	12.5-20.6
S2	23.4%	18.75-28.0
S3	8.6%	5.5-11.6

A1: Those with age of diagnosis at 16 years or younger; A2 and A3 for age of diagnosis at 17-40 years and > 40 years, respectively.