[Retracted] Factors Affecting Transfusion during Percutaneous Nephrolithotomy: A Retrospective Study of 665 Cases

Table 5

Surgical factors according to transfusion.

Parameters	Transfusion (+) %	Transfusion (-) %	value
	23	642
Access number			1^b
1	82.6 (19)	88.5(568)
≥2	8.7(2)	11.5(74)
Calyx ox puncture
Upper	8.7(2)	5.5(35)	0.209^a
Middle	65.2(15)	57.5(369)
Low	26.1(6)	49.2(316)
Stone free rate
Residual	39.1 (9)	19.9(128)	0.031^a
Clear	60.9 (14)	80.1 (514)

^aChi-square test. ^bFisher’s exact test.