Table 2.
Univariate analysis of risk factors for massive hemorrhage after PCNL (continuous variables).
| Control | Test | P value | |
|---|---|---|---|
| BMI (kg/m2) | 98 (23.1712 ± 3.23159) | 69 (23.4697 ± 3.06409) | 0.326 |
| Operative time (min) | 98 (116.5306 ± 34.41086) | 69 (130.9375 ± 43.30471) | 0.107 |
| Age (yr) | 98 (49.7857 ± 11.54485) | 69 (51.3125 ± 13.37241) | 0.467 |
| Stone size (cm) | 98 (2.2816 ± 1.03718) | 69 (2.5641 ± 1.09448) | 0.726 |
| Glomerular filtration rate (GFR) (ml/min) | 98 (35.8458 ± 13.89348) | 69 (22.5424 ± 20.48616) | 0.004 |
Data are presented as the mean (standard deviation); BMI = body mass index.