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Histology injury score chart
| Grade | 0 | 1 | 2 | 3 | 4 |
| Inflammation | None | Mild | Moderate | Severe | - |
| Mucosal damage | None | Mucous layer | Submucosa | Muscularis and serosa | - |
| Crypt damage | None | 1/3 | 2/3 | 100% | 100% with epithelium loss |
| Pathological change range | None | 0%-25% | 26%-50% | 51%-75% | 76%-100% |
