Table 1.

Histology grading of colitis

Feature	Score	Description
Damage	0	None
	1	Loss of the basal 1/3 of the crypt
	2	Loss of the basal 2/3 of the crypt
	3	Loss of entire crypt but intact surface epithelial cells
	4	Loss of both the entire crypt and the surface epithelial cells
Percentage area involvement	1	1–25%
	2	26–50%
	3	51–75%
	4	76–100%