Table 2.

Comparison of intra-operative values

	BMI				p values
	<30		≥30
		%		%
Number of patients	133		49
Mean operation time (minutes)	111.4 ± 42.5 (45–250)		109.6 ± 41.6 (40–240)		0.805
Mean fluoroscopy time (minutes)	5.4 ± 3.4 (0.7–18.8)		5.8 ± 4.7 (0.8–20)		0.471
Number of access					0.415
1	123	92.5	43	87.8
2	9	6.8	6	12.2
3	1	0.8	0	0
Access site					0.486
Multiple	7	5.4	4	8.2
Lower calyces	105	78.9	41	83.7
Middle calyces	17	12.8	3	6.1
Upper calyces	4	0.8	1	2.0

BMI Body Mass Index