Table 3. Logistic regression analysis for different factors affecting the success rate after the first ESWL session.
| Variable | Univariate | Multivariable* | |||
|---|---|---|---|---|---|
| OR (95% CI) | P value | OR (95% CI) | P value | ||
| Age (continuous) | 0.99 (0.97–1.02) | 0.563 | – | – | |
| Sex (female) | 0.99 (0.48–2.06) | 0.984 | – | – | |
| Body mass index (continuous) | 0.99 (0.87–1.12) | 0.878 | – | – | |
| Stone size (continuous) | 0.67 (0.55–0.81) | 0.001 | 0.81 (0.66–0.99) | 0.049 | |
| SSD (continuous) | 1.01 (0.98–1.03) | 0.519 | – | – | |
| HU (continuous) | 0.95 (0.98-0.99) | 0.001 | 0.99 (0.98–0.99) | 0.001 | |
| Ureteral stone location | |||||
| Proximal | Ref | ||||
| Mid | 0.86 (0.14–5.47) | 0.878 | |||
| Distal | 1.24 (0.62–2.48) | 0.544 | |||
| Preoperative eGFR (continuous) | 0.99 (0.97–1.01) | 0.988 | |||
| ESWL intensity | |||||
| a–c | Ref | ||||
| 1 | 1.50 (0.23–9.61) | 0.669 | |||
| 2 | 0.79 (0.14–4.54) | 0.790 | |||
| 3 | 0.94 (1.40–6.28) | 0.947 | |||
*, significant variables (P<0.2) according to the univariate analysis were included in the multivariable analysis. SSD, skin-to-stone distance; HU, Hounsfield units; ESWL, extracorporeal shock wave lithotripsy.