Table 2.

Perioperative outcomes according to preoperative ureteral stenting

	After propensity score-matching
Variables	Non-stented group (n = 339)	Preoperatively stented group (n = 113)	p-value
Operative time (min)	70.2 ± 53.0	65.1 ± 47.4	0.452
Access sheath placement	297 (87.6%)	106 (93.8%)	0.038
Access sheath size (Fr)			0.223
11/13	147 (49.5%)	49 (46.2%)
12/14	150 (50.5%)	56 (52.8%)
14/16	0 (0.0%)	1 (0.9%)
Stone-free rate (0 mm)	282 (83.2%)	97 (85.8%)	0.498
Clinically insignificant residual fragments (<  4 mm)	315 (92.9%)	103 (91.2%)	0.806
Hospitalization period (days)	1.4 ± 1.7	1.3 ± 0.7	0.279
Additional treatment	11 (3.2%)	6 (5.3%)	0.421