Role of variation coefficient of stone density in determining success of shock wave lithotripsy in urinary calculi

Table 3 Univariate and multivariate logistic regression analyses for significant factors regarding shock wave lithotripsy (one-session success)

Variable	Univariate			Multivariate
	OR	95%CI	P value	OR	95%CI	P value
Mean stone density	1.003	1.003-1.004	< 0.0001	1.003	0.424-1.346	< 0.0001
Standard deviation of stone density	0.996	0.995-0.998	< 0.0001	0.997	0.993-1.001	0.13
VCSD (%)1	0.895	0.874-0.917	< 0.0001	0.929	0.894-0.964	< 0.0001
Stone volume (mm3)	1.009	1.007-1.012	< 0.0001	1.005	1.002-1.009	< 0.005
Age (year)	0.99	0.985-1.012	0.86
Skin-stone distance	1.02	0.947-1.112	0.52
Gender (male)	0.949	0.611-1.475	0.81

¹Variation coefficient of stone density.

VCSD: Variation coefficient of stone density.