Table 1: Semi-quantitative measurement criteria of edema, vascular proliferation and fibrosis.
| Grade | Edema | Vascular proliferation | Fibrosis |
| 0 | None | None | None |
| 1 | Minimal dissociation of collagen bands (34%) | Minimal increase in vascular structures (42%) | Minimal increase in number of fibroblasts (27%) |
| 2 | Marked dissociation of collagen bands and fluid between the bands (66%) | Intense clustering of vascular structures (58%) | Extensive fibrosis (73%) |