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Performance characteristics of risk stratification framework
| Hydronephrosis (n=35) | No hydronephrosis (n=246) | Total | |
| (A) High cut-off | |||
| High-risk | 30 | 81 | 111 |
| Medium-risk or low-risk | 5 | 165 | 170 |
| Total | 35 | 246 | 281 |
| (B) Medium cut-off | |||
| High-risk or medium-risk | 31 | 156 | 187 |
| Low-risk | 4 | 90 | 94 |
| Total | 35 | 246 | 281 |
