Table 1. Baseline characteristic of study patients.

No. pts		48
Mean ± SD age		46.4±14.3
% Male		29.16
Mean ± SD body mass index (kg/m2)		28.3±7.6
% Right kidney		56.3
% American Society of Anesthesiologist score:
	I / II / III / IV	50 / 43.7 /6.3 / 0
	% Ipsilateral Prior surgery(PCNL or SWL)	25
	% of patients with spina bifida or spine injury	0
	% Immediate success (fragments ≤4mm POD1)	66.7
% Stone-free (no fragments POD1)		29.2
%Final Success Rate (after all auxiliary procedures)		92.3
% Complications		16.7
Mean ± SD operative time (min)		122.3±46.1
% Guy´s Stone Score:
	1	10.4
	2	39.5
	3	33.4
	4	16.7
% S.T.O.N.E. Nephrolithometry
	5-6	18.75
	7-8	50
	9-12	31.25
% CROES Nephrolithometric Nomogram
	130-169	16.75
	170-219	39.5
	>220	43.75