| Parameters | Grade (0-3 or 0-4) | ||||
| 0 | 1 | 2 | 3 | 4 | |
| Inflammation | none | slight | moderate | severe | – |
| Inflamed area/extent | none | mucosa | mucosa and submucosa | transmural | – |
| Crypt damage | none | basal 1/3 damaged | basal 2/3 damaged | only the surface epithelium is intact | entire crypt and epithelium are lost |
| Percent involvement | none | 1%~25% | 26%~50% | 51%~75% | 76%~100% |