Table 2. Comparison of operative outcome and complications between the groups.
| Group | URS with PNS (n=61) | URS without PNS (n=75) | P value |
|---|---|---|---|
| Operation time (min) | 55 [23–155] | 55 [21–217] | 0.84 |
| Total energy (KJ) | 2.2 [0.2–9.7] | 1.7 [0.2–9.8] | 0.25 |
| Stone-free | 58 [95] | 58 [77] | 0.004 |
| Additional treatment (2nd URS) | 2 [3] | 11 [15] | 0.04 |
| Ureteral injury | 3 [5] | 8 [11] | 0.34 |
| Postoperative fever | 3 [5] | 4 [5] | 1.00 |
| Postoperative hydronephrosis | 10 [16] | 12 [16] | 0.95 |
| Grade 1 | 10 [16] | 8 [11] | |
| Grade 2 | 0 [0] | 2 [3] | |
| Grade 3 | 0 [0] | 2 [3] | |
| Ureteral stenosis | 0 [0] | 2 [3] | 0.23 |
| Postoperative hospital days | 2 [1–7] | 2 [1–7] | 0.44 |
Date are presented as median [range] or n [%]. URS, ureteroscopy; PNS, percutaneous nephrostomy.