Table 1. Comparison of preoperative patient characteristics between groups A and B.
| Characteristic | Group A (n=172) | Group B (n=76) | p-value |
|---|---|---|---|
| Age (y) | 56.1±12.3 | 58.6±11.0 | 0.137 |
| Sex | 0.206 | ||
| Male/female | 115/57 | 46/30 | |
| Body mass index (kg/m2) | 24.5±3.2 | 25.0±5.1 | 0.393 |
| Stone size (mm) | 11.1±4.8 | 11.1±5.2 | 0.946 |
| Unilateral/bilateral | 64/12 | 136/36 | 0.222 |
| Hounsfield unit | 905.0±428.8 | 860.8±438.6 | 0.457 |
| Stone position | 0.497 | ||
| Upper calyx | 29 (16.9) | 13 (17.1) | |
| Mid calyx | 49 (28.5) | 22 (28.9) | |
| Lower calyx | 94 (54.7) | 41 (54.0) |
Values are presented as mean±standard deviation or number (%).
Group A, active stone removal group; group B, fragmentation-only group.