Table 2. Analysis of Variables and Immediate Post-Operative Stone-Free Rates.

Variables	Number of Cases	Stone-Free Rate, No. (%)	P value
Indication			0.045
Primary RIRS	42	27 (64.3)
Secondary RIRS	23	9 (39.1)
Location			0.107
Lower pole with or without others	27	12 (44.4)
Others	38	24 (63.2)
Cumulative stone burden (mm2)			0.273
Less than 80	44	26 (59.1)
80 and above	21	10 (47.6)
Radio-opacity			0.141
Yes	51	26 (51.0)
No	14	10 (71.4)
Combination with ureteral stone			0.236
Yes	10	4 (40.0)
No	55	32 (58.2)