| Etiology | |||
| Benign | Malignant | ||
| p-value | p-value | ||
| Urea | Pre × POI | 0.187 | <0.001* |
| Pre × POT | 0.010 | <0.001* | |
| Pre × 1 year | 0.001* | <0.001* | |
| POI × POT | 0.073 | 0.039 | |
| POI × 1 year | 0.066 | 0.753 | |
| POT × 1 year | 0.474 | 0.502 | |
| Creatinine | Pre × POI | 0.002* | <0.001* |
| Pre × POT | 0.172 | <0.001* | |
| Pre × 1 year | 0.031 | <0.001* | |
| POI × POT | 0.165 | 0.032 | |
| POI × 1 year | 0.300 | <0.001* | |
| POT × 1 year | 0.287 | 0.013 | |