Table 1.

Criteria for scoring the gross morphologic damage of colon tissue[6-9]

Score	Gross morphology
0	No damage
1	Localized hyperemia with no ulcers
2	Linear ulcers with no significant inflammation
3	Linear ulcers with inflammation at one site
4	More site of ulcers and inflammation, the size of ulcers <1 cm
5	Multiple inflammation and ulcers, the size of ulcers≥1 cm