Preoperative hydronephrosis is a predictive factor of ureteral stenosis after flexible ureteroscopy: a propensity scores matching analysis

Table 2 Patient observational outcomes

	Before propensity matching			After propensity matching
	Mild hydronephrosis	Moderate and severe hydronephrosis	P value	Mild hydronephrosis	Moderate and severe hydronephrosis	P value
	N = 349	N = 120	P value	N = 75	N = 75	P value
Ureteral stenosis	2.3%	18.3%	0.000	0	16.0%	0.000
Ureteral injury (≥ grade2)	5.2%	42.5%	0.000	5.3%	37.3%	0.000
Operation time	67.75 ± 33.62	83.29 ± 37.89	.000	74.90 ± 31.29	80.12 ± 37.53	0.383
SFR	88.5%	78.3%	.006	77.3%	80.0%	0.839

ISSN: 1471-2490