Table 1.

Demographics of patients treated with flexible URSL with Ho:YAG laser for renal calculi.

Variable	Value	Test of sig. Z-test	P
Mean (SD; range) age, years	48.2 (8; 28–54)
Male/female, n	66/14	8.3	<0.001
Right/left, n	18/62	8.1	<0.001
Symptomatic/asymptomatic, n	72/8	10.1	<0.001
Associated ureteric stones, n (%)	13 (16.3)	8.6	<0.001
Bilateral/unilateral, n	10/70	9.4	<0.001
Single/multiple, n	52/28	3.8	<0.001
Lower calyx/different calyces, n	48/32	2.5	0.01
Mean (SD; range) stone size, mm	8.4 (2.6; 3–23)	3.4	<0.001
Mean (SD; range) stone number	2.2 (0.3; 3–8)	2.9	0.001
Mean (SD; range) stone burden, mm	13 (2.5; 6–23)	4.3	<0.001
Stone burden (mm), n (%)
<15	64 (80)	7.6	<0.001
⩾15	26 (20)	7.6	<0.001
Localisation, n (%)
Lower calyx	58 (72.5)	5.8	<0.001
Other calyces	18 (22.5)	6.8	<0.001
Pelvis	4 (5)	11.4	<0.001