The role of preoperative ureteral diameter measurements in predicting difficult access during retrograde ıntrarenal surgery: a retrospective analysis of 234 patients

Table 1 Demographic and Ureter and stone diameters profiles of the groups

Parameters	DAG n = 38 Mean ± SD (median)	NDAG n = 196 Mean ± SD (median)	95% CI (LL) − (UL)	p value
Gender female, n (%)	7 (18.42%)	52 (26.53%)	–	0.292^NS
Age, years	38.73 ± 1.73 (40.00)	43.10 ± 0.87 (40.00)	(− 8.54) − (− 0.18)	0.138^NS
Body Mass Index (BMI)	27.51 ± 0.72 (26.82)	26.63 ± 0.30 (26.45)	(− 0.64) − (2.38)	0.310^NS
Right stone diameter, mm	6.52 ± 0.91 (6.00)	6.87 ± 0.52 (6.00)	(− 2.82) − (2.12)	0.856^NS
Left stone diameter, mm	6.44 ± 1.02 (6.50)	8.22 ± 0.55 (7.50)	(− 4.42) − (0.86)	0.294^NS
Right middle ureter iliac, mm	4.34 ± 0.17 (4.00)	4.94 ± 0.11 (5.00)	(− 1.15) − (− 0.04)	0.048*
Left middle ureter iliac, mm	4.15 ± 0.21 (4.00)	4.91 ± 0.13 (4.00)	(− 1.37) − (− 0.13)	0.014*
Right upper ureter diameter, mm	4.36 ± 0.25 (4.00)	5.76 ± 0.18 (5.00)	(− 2.26) − (− 0.52)	0.000**
Left upper ureter diameter, mm	4.57 ± 0.29 (4.00)	6.02 ± 0.20 (5.00)	(− 2.40) − (− 0.47)	0.001**

Parameters; Ureter and stone diameters were determined by preoperative CT examination
Data are expressed as mean values, standard deviation (SD), median
Chi-Square Test and Mann–Whitney U Test were used in statistical analysis
DAG difficult access group, NDAG not difficult access group, CI (LL) − (UL): Confidence Interval (Lower Limit) − (Upper Limit)
*p < 0.05, **p < 0.001, ^NS Not Significant