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Stone characteristics
| Variables | PS-URS group N=66 |
I-URS group N=60 |
p-value | |
|---|---|---|---|---|
| Mean stones size, mm | 8.99±1.14 | 9.44±1.07 | 0.10 a | |
| Stones side, n (%) | Right | 30 (45.4) | 20 (33.3) | 0.20 b |
| Left | 36 (54.6) | 40 (66.7) | ||
| Stones site, n (%) | Upper | 20 (30.3%) | 11 (18.4%) | 0.29 c |
| Mid | 22 (33.3) | 23 (38.3) | ||
| Lower | 24 (36.4) | 26 (43.3) | ||
| Hydronephrosis, n (%) | Mild | 11 (16.7) | 9 (15) | 0.17 c |
| Moderate | 34 (51.5) | 40 (66.6) | ||
| Severe | 21 (31.8) | 11 (18.4) | ||
independent-sample t-test; b Fisher’s exact test; c Chi-square test
