The Analysis of Risk Factors for Hemorrhage Associated with Minimally Invasive Percutaneous Nephrolithotomy

Table 3

Outcomes of multivariate binary logistic regression analysis: factors affecting total blood loss.

Factors	B	Wals	P-value	OR	95%CI
Stone size (mm^2)	0.975	28.766	<0.001	2.652	1.857-3.788
Staghorn	0.378	7.092	0.008	1.459	1.105-1.926
NO
YES
Duration of operation	0.676	6.177	0.013	1.965	1.154-3.348
Degree of hydronephrosis
	-1.366	45.749	<0.001	0.255	0.172-0.379

According to median drop in hemoglobin; OR=odds ratio; CI=confidence interval.