Table 3. Univariable and multivariable Cox regression analysis of predicting factors for renal function deterioration in 163 patients treated by retrograde flexible ureteroscopy and intracorporeal lithotripsy for intrarenal stones.
| Univariable | Multivariable | ||||
|---|---|---|---|---|---|
| p value | HR (CI) | p value | HR (IC) | ||
| Female gender (versus male) | 0.109 | 0.26 (0.05-1.3) | - | - | |
| Age (continuous) | 0.069 | 1.043 (0.99-1.09) | - | - | |
| Multiple stones (vs unique stone) | 0.3 | 3.1 (0.36-25.6) | - | - | |
| Cumulative stone diameter (continuous) | 0.587 | 0.96 (0.819-1.120) | - | - | |
| Stone free (vs stone persistence) | 0.088 | 0.26 (0.06-1.22) | - | - | |
| Multiple procedures | 0.023 | 5.4 (1.2 - 23.1) | 0.156 | 3.12 (0.65-15) | |
| Preoperative stenting (vs. no stent) | 0.117 | 5.4 (0.65-45.5) | - | - | |
| Preoperative CKD group >1 | 0.011 | 6.8 (1.6-30.4) | 0.054 | 4.7 (0.97-23.4) | |
| Operation time (continuous) | 0.522 | 1.005 (0.98-1.02) | - | - | |
| Postoperative double pigtail stent (vs ureteral stent) | 0.773 | 1.2 (0.2-7.3) | - | - | |
| Postoperative pyelonephritis | 0.416 | 2.5 (0.27-23.3) | |||
HR=Hazard ratio; CI=Confidence interval