| Parameter | Segmental hemorrhagic colitis (n=9) | Pseudomembranous colitis (n=10) | p |
| Distribution | |||
| Pancolitis | 0 | 7/10 (70 percent) | <0.01 |
| Terminal Ileum | 0 | 0 | - |
| Small intestine* | 0 | 0 | - |
| Ascending colon | 9/9 (100 percent) | 7/10 (70 percent) | n.s. |
| Transverse colon | 3/9 (33 percent) | 7/10 (70 percent) | n.s. |
| Sigmoid | 1/9 | 10/10 (100 percent) | <0.001 |
| Bowel wall thickening [mm] | 8 ± 2 (6 - 12) | 8 ± 2 (4 - 10) | n.s. |
| Longitudinal bowel wall involvement [cm] | 20 ± 7 (15 - 35) | all >30 cm | - |
| Asymmetric bowel wall thickening | 9/9 (100 percent) | 0/10 (100 percent) | <0.01 |
| Thickening of the mesentery | 2/9 (22 percent) | 8/10 (80 percent) | <0.05 |
| Abscess | 0 | 0 | n.s. |
| Fistula | 0 | 0 (82) | n.s. |
| Mesenteric lymphadenopathy¶ | 1/9 | 6/10 (60 percent) | <0.05 |
| Ascites | 6/9 (66 percent) | 6/10 (60 percent) | n.s. |
