Neutrophils in epithelium and the presence of an erosion or ulceration
| Grade | Location 1+3+5+7 | Location 2+4+6 |
| 5.0 | 8 | 5 |
| 5.1 | 3 | 0 |
| 5.2 | 16 | 2 |
| 5.3 | 14 | 0 |
| 5.4 | 6 | 0 |
Neutrophils in the surface epithelium (1, 3, 5, and 7) or crypt epithelium (2, 4, and 6) and the presence of an erosion or ulceration (major grade 5): the numbers indicate the number of biopsies involved and assessed by one observer. Neutrophils in the crypts were less common when an erosion was present.