Efficacy and safety of Kumpe access catheter for pre-percutaneous nephrolithotomy renal access in modified supine percutaneous nephrolithotomy

Table 3 Multivariate regression analysis for RET as a dependent variable

	Unstandardized coefficient		Standardized coefficient	t	P value
	B	Standardization error	β	t	P value
Constant	72.601	11.361		6.390	0.000
Catheter type	− 25.633	2.800	− 0.621	− 9.156	0.000
Renal stone type	0.417	1.907	0.015	0.219	0.827
Multiplicity of renal stone	− 1.199	2.635	− 0.030	− 0.455	0.650
Puncture site	− 0.785	2.853	− 0.018	− 0.275	0.784

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