| Variable | Frequency | Percentage | |
| Hydronephrosis | Yes | 40 | 34.2% |
| No | 77 | 65.8% | |
| Anesthesia | GA | 74 | 63.2% |
| Spinal | 43 | 36.8% | |
| Number of tracts | 1 | 104 | 88.9% |
| 2 | 12 | 10.3% | |
| 3 | 1 | 0.9% | |