Table 1.
The histological scoring system of kidney injury.
| Feature | Score | Description |
|---|---|---|
| Interstitial fibrosis | 0 | Normal interstitium and tubules |
| 1 | Mild interstitial thickening between the tubules | |
| 2 | Moderate interstitial thickening between the tubules | |
| 3 | Severe interstitial thickening between the tubules | |
|
| ||
| Tubular injury∗ | 0 | No tubular injury |
| 1 | <10% of tubules injured | |
| 2 | 10%~25% of tubules injured | |
| 3 | 26%~50% of tubules injured | |
| 4 | 51%~75% of tubules injured | |
| 5 | >75% of tubules injured | |
∗Tubular injury was defined as tubular dilation, tubular atrophy, vacuolization, sloughing of tubular epithelial cells, or thickening of the tubular basement membrane.