Table 2. Operative and postoperative data.
| N or mean | % or ±SD | |
|---|---|---|
| Operative time (min) | ||
| UAS | 63.5 | ±32.4 |
| Number of stone | 283 | 79.5% |
| - Single | 228 | 64.1% |
| - Multiple | 128 | 35.9% |
| LOS | 2 | ±2 |
| Stone size | ||
| - length (mm) | 12.5 | ±5.3 |
| - width (mm) | 9.4 | ±4.5 |
| Stone location | ||
| - upper calyx | 9 | 2.5% |
| - mild calyx | 29 | 8.1% |
| - lower calyx | 58 | 16.2% |
| - pelvis | 92 | 25.8% |
| - UPJ | 73 | 20.5% |
| - pelvis + calyx | 79 | 22.1% |
| - multiple calyces | 34 | 9.5% |
| Stone composition | ||
| - Ca oxalate | 164 | 46% |
| - Uric acid | 16 | 4.5% |
| - Mixed (Ca oxalate+Uric acid) | 28 | 7.8% |
| - Brushite | 43 | 12% |
| - Struvite | 7 | 2% |
| - Cystine | 18 | 5% |
| - Other | 7 | 2% |
| - Unknown | 92 | 25.8% |
| Pre-operative stent or nephrostomy | 77 | 21.6% |
| Stone X-ray characteristics | ||
| - radiopaque | 274 | 76.9% |
| - radiolucent | 90 | 23.1% |
| Post-operative stenting | 332 | 93% |
| Re-intervention | 20 | 5.5% |
| SFR | ||
| - First procedure | 262 | 73.6% |
| - Second procedure | 281 | 78.9% |
Values are mean and SD or absolute number and percentage. N = number; LOS = length of stay; UPJ = ureteropyelic junction; SFR = stone free rate; Ca = calcium.