RESULTS	PCNL was associated with shorter operative time ( 127 + / - 30 vs 204 + / - 31 minutes , p < 0.001 ) , shorter hospital stay ( 6.4 + / - 4.2 vs 10 + / - 4.2 days , p < 0.001 ) and earlier return to work ( 2.5 + / - 0.8 vs 4.1 + / - 1 weeks , p < 0.001 ) .\