Table 1.

Histological scoring system of colitis according to Dieleman et al. [17] with modification.

Histological changes	0	1	2	3	4
Degree of inflammation	None	Mild	Moderate	Severe	–
Extent of inflammation	None	Mucosa	Mucosa	Submucosa	Transmural
Crypt damage	None	Damage of basal 1/3	Damage of basal 2/3	Intact surface epithelium only	Loss of entire epithelium and crypt
Ulcer	Absence of ulcer	1 or 2 foci of ulceration	3 or 4 foci of ulceration	More than 4 foci of ulceration	Confluent & extensive ulceration