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Patient and stone characteristics
| Feature | Mean (range) |
|---|---|
| Sample size, n | 38 |
| Age, years | 49 (45; 53) |
| Body mass index, kg/m2 | 27 (25; 28) |
| ASA, scores | 2 (1; 3) |
| Maximum diameter of the stone, mm | 10 (10; 14) |
| Density of the stone, HU | 1060 (930; 1190) |
| Stone location | |
| Upper calyx | 16 |
| Middle calyx | 11 |
| Lower calyx | 7 |
| Pyelus | 4 |
| Duration of RIRS, min | 26 (14; 32) |
| Stone free rate | 86% |
