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Stone size distribution
| Size | Group I n (%) | Group II n (%) | Total n (%) |
|---|---|---|---|
| 4 mm | 3 (10) | 2 (6) | 5 (8) |
| 5 mm | 7 (23) | 6 (20) | 13 (22) |
| 6 mm | 7 (23) | 7 (23) | 14 (23) |
| 7 mm | 5 (17) | 4 (13) | 9 (15) |
| 8 mm | 6 (20) | 7 (23) | 13 (22) |
| 9 mm | 2 (6) | 3 (10) | 5 (8) |
| 10 mm | 0 | 1 (3) | 1 (2) |
P=0.359
