Table 1.

Criteria for macroscopic grading of the experimental colitis

	Macroscopic grading
Feature	0	1	2	3
Stool	Normal	Loose stool	Diarrhea	Diarrhea with blood
Hyperemia	None	Focal	Focal and thickening of bowel wall	Extensive thickening of bowel wall
Adhesions	None	Mild	Moderate	Extensive
Megacolon	None	Mild	Moderate	Toxic megacolon
Ulcerations	None	Mild ulceration on one side < 1 cm	Moderate ulceration > 1 cm	Severe damage extending > 2 cm