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Univariate analysis of factors that affect stone free rate after PCNL.
| Characteristics | Stone free status | Clinically significant Residual stones | p-value |
|---|---|---|---|
| Number of patients | 86 | 6 | |
| Stone Size | |||
| <3 cm | 62 | 0 | 0.0008 |
| >3 cm | 24 | 6 | |
| Stone opacity | |||
| Radiopaque | 72 | 2 | 0.0125 |
| Radiolucent | 14 | 4 | |
| Number of access | |||
| Single | 60 | 2 | 0.0859 |
| Multiple | 26 | 4 | |
| Duration of surgery | |||
| Less than 90 min | 69 | 1 | 0.0027 |
| More than 90 min | 17 | 5 | |
| Complications | |||
| Yes | 11 | 4 | 0.0044 |
| No | 75 | 2 | |
