Table 3.
Univariable and multivariable logistic regression analyses.
| Variable | Univariate Analysis | Multivariate Analysis | ||||||
|---|---|---|---|---|---|---|---|---|
| 95.0% CI | 95.0% CI | |||||||
| Odds Ratio | Inferior | Superior | p-Value | Odds Ratio | Inferior | Superior | p-Value | |
| Age | 0.99 | 0.96 | 1.02 | 0.59 | - | - | - | - |
| BMI | 1.01 | 0.92 | 1.08 | 0.9 | - | - | - | - |
| Side | 0.78 | 0.39 | 1.56 | 0.49 | - | - | - | - |
| Position (related to kidney) | 1.1 | 0.9 | 1.35 | 0.32 | - | - | - | - |
| Position (related to ureter) | 0.85 | 0.59 | 1.21 | 0.36 | - | - | - | - |
| Maximum diameter | 1.15 | 1.05 | 1.25 | 0.001 | 0.98 | 0.83 | 1.16 | 0.88 |
| Number of stones | 2.24 | 1.25 | 4.01 | 0.006 | 0.9 | 0.3 | 2.68 | 0.85 |
| Hounsfield Units | 0.99 | 0.99 | 1 | 0.21 | - | - | - | - |
| Preoperative white cell count | 1.08 | 0.94 | 1.23 | 0.26 | - | - | - | - |
| Preoperative-creatinine | 1.05 | 0.94 | 1.18 | 0.33 | - | - | - | - |
| Postoperative white cell count | 1.08 | 0.95 | 1.23 | 0.2 | - | - | - | - |
| Postoperative s-creatinine | 1.03 | 0.89 | 1.19 | 0.64 | - | - | - | - |
| Type of instrument (multi-use vs. single-use) | 1.28 | 0.55 | 0.97 | 0.01 | 1.3 | 0.55 | 0.99 | 0.03 |
| Type of energy | 0.89 | 0.45 | 1.76 | 0.75 | - | - | - | - |
| Operative time | 1.13 | 1.08 | 1.18 | <0.001 | 1.14 | 1.08 | 1.2 | <0.001 |