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Histological score of colitis according to Iba et al.(2003)
| Score | Loss of epithelium (%) | Crypt damage1(%) | Depletion of goblet cells | Infiltration of inflammatory cells |
| 0 | None | None | None | None |
| 1 | 0~5 (mild) | 0~10 (mild) | Mild | Mild |
| 2 | 5~10 (moderate) | 10~20 (moderate) | Moderate | Moderate |
| 3 | >10 (severe) | >20 (severe) | Severe | Severe |
Crypt damage was evaluated as percentage loss of crypt
