Table 2.

Macroscopic evaluation of colonic tissues.

Score	Histological changes	Length of bowel damage
0	Normal	None
1	Erythema	<20%
2	Slight dropsy, and small erosions	21–40%
3	More hemorrhagic ulcers or moderate inflammation or conglutination	41–60%
4	Severe ulceration and serious conglutination	>61%