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Table 3 The SWL outcome (case %) according to stone radio-opacity and comparisons (Chi square p values) among these groups

From: Has the pelvic renal stone position inside the upper loop of JJ stent any influence on the extracorporeal shock wave lithotripsy results?

SWL outcome	Case %				p values
SWL outcome	IR	MR	SR	All	IR versus MR	IR versus SR	IR versus other	SR versus MR	SR versus other
SF after 1st SWL	3.6	5.0	17.4	8.0	0.937	0.045	0.225	0.040	0.015
SF after 2nd SWL	10.7	16.7	26.1	17.3	0.510	0.044	0.165	0.345	0.102
SF after 3rd SWL	14.3	18.3	17.4	16.7	0.736	0.876	0.712	0.896	0.938
Overall stone free	28.6	40.0	60.9	42.0	0.272	0.002	0.019	0.034	0.004
Residual fragments	33.9	31.7	26.1	30.9	0.951	0.522	0.644	0.196	0.522
Stone not fragmented	37.5	28.3	13.0	27.1	0.394	0.010	0.049	0.098	0.019

Values in italics for p < 0.05
IR intense radiopaque (similar or superior to 12th rib opacity), MR moderate radiopaque (less opaque than 12th rib), SR slightly radiopaque (barely visible), SF stone free

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