Table 1. Significant preoperative and intraoperative data of the patients.

	Group 1	Group 2	P value
	(n:676)	(n:282)
Mean age (years)	47.9	48.9	0.065
Gender
Male	422 (62.4)	150 (53.1)	0.557
Female	254 (37.6)	132 (46.9)
Stone Load (%)
Simple	387 (57.2)	156 (55.3)	0.583
Complex	289 (42.8)	126 (44.7)
Operation time (min.)	72.4	65.4	0.683
Fluoroscopy time (sec)	144.4	149.3	0.803
Site of access (%)
Subcostal	709 (90.3)	282 (88.6)	0.341
Intercostal	76 (9.7)	37 (11.4)
Number of access
One	580	251	0.311
Two	83	25
Three	13	6
Stone-free status (%)	466 (69)	203 (72)	0.348