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PCNL: percutaneous nephrolithotomy
| Standard PCNL | Tubeless PCNL | p-value | |
| Average number | 1.5 | 1.8 | 0.14 |
| Size | 3.81 cm | 3.16 cm | 0.008 |
| Hydronephrosis: | 0.43 | ||
| -Absent | 24 (32.4%) | 21 (41.2%) | |
| -Mild | 34 (45.9%) | 23 (45.1%) | |
| -Severe | 16 (21.6%) | 7 (13.7%) | |
| Stone site: | |||
| -Pelvic | 15 (20.3%) | 12 (23.5%) | 0.66 |
| -Staghorn | 35 (47.3%) | 12 (23.5%) | 0.007 |
| -Pelvicalyceal | 20 (27%) | 23 (45.1%) | 0.037 |
| -Calyceal | 4 (5.4%) | 45 (7.8%) | 0.58 |
