Predictors of Clinical Outcomes of Flexible Ureterorenoscopy with Holmium Laser for Renal Stone Greater than 2 cm

Table 3

Stone Demographics characteristics, preoperative and intraoperative data.

Variable	Results	P  value	Test
Size (SD) mm	26.3 ± 7.3	.001	Fisher’s exact
20–30	104 (84.6%)
>30	19 (15.4%)
Associated lower calyx stone		.16	Fisher’s exact
Yes	71 (57.7%)
No	52 (42.3%)
Site (RU)		.85	Chi-square
Pelvic	22 (17.9%)
Lower calyx	13 (10.6%)
Middle calyx	1 (0.8%)
Upper calyx	2 (1.6%)
Mixed pelvic and  calyces	67 (54.5%)
Mixed calyces	18 (14.6%)
Stone Nature		.22	Chi-square
Ca oxalate	71 (57.7%)
Mixed	9 (7.3%)
Uric acid	7 (5.7%)
Brushite	11 (9.0%)
Struvite	6 (4.9%)
Cystine	19 (15.4%)
Stone number		.81	Fisher’s exact
Isolated	53 (43.1%)
Multiple	70 (56.9%)
Preoperative DJ stent		.44	Fisher’s exact
Yes	81 (65.9%)
No	42 (34.1%)
Operative time (minute)	89 ± 24	.34	Mann-Whitney
Use of ureteral access sheath	117 (95.1%)	.041	Fisher’s exact