Table 1.
Patient and stone characteristics
| Cases, n (%) | Total stone volume, p | Operative time, minutes | p | |
|---|---|---|---|---|
| Gender | 0.499 | 0.878 | ||
| Male | 420 | 70.44 | ||
| Female | 150 | 70.85 | ||
| Age, years | 0.455 | 0.041 | ||
| < 16 | 85.33 | |||
| 16–69 | 69.2 | |||
| >70 | 76.69 | |||
| Mean CT stone volume, mm3 | 570 | 70.55 (23–271) | < 0.005 | |
| 365.72 (5.66–4,613.27) | ||||
| Mean stone HU | 0.71 | |||
| 967.54 (203–1,844) | ||||
| Stone number | < 0.001 | 0.001 | ||
| 1 | 423 (74.2%) | 67.62 | ||
| 2 | 104 (18.2%) | 77.73 | ||
| 3 or more | 43 (7.5%) | 83.70 | ||
| Stone location | < 0.005 | < 0.005 | ||
| Kidney | 171 (30%) | 78 | ||
| Ureter | 353 (61.9%) | 65.43 | ||
| Both | 46 (8.1%) | 82.53 | ||
| KUB radiopaque | 0.701 | 0.004 | ||
| Yes | 399 (77.2%) | 71.93 | ||
| No | 118 (22.8%) | 64.42 | ||
| Bilateral treatment | 0.237 | 0.194 | ||
| Yes | 18 (3.2%) | 78.88 | ||
| No | 552 (96.8%) | 70.27 | ||
| Hydronephrosis | 0.731 | 0.786 | ||
| Yes | 438 (76.9%) | 70.33 | ||
| No | 132 (23.1%) | 71.08 | ||
| Prior stent | 0.076 | 0.002 | ||
| Yes | 154 (27.1%) | 76.41 | ||
| No | 416 (72.9%) | 68.27 | ||
| Prior nephrostomy | 0.5 | 0.163 | ||
| Yes | 14 (2.5%) | 85.63 | ||
| No | 556 (97.5%) | 71.79 | ||
| Ureteroscope used | < 0.005 | < 0.005 | ||
| Semirigid | 319 (56%) | 64.72 | ||
| Flexible | 229 (40.1%) | 78.1 | ||
| Both | 22 (3.9%) | 77 |