Table 1. Demographic and Clinical Characteristics .

Variable	LL (n=135 )	PL (n=115 )
Mean age ± SD, y	40.1±3.8	39.2±4.3
Male, No. (%)	91 (67.4)	73 (63.4)
Previous history of TUL, No. (%)	13 (9.6)	11 (9.5)
Stone laterality
Right side, No. (%)	82 (60.7)	74 (64.3)
Bilateral, No. (%)	6 (4.4)	7 (6)
Stone location
Upper, No. (%)	33 (24.4)	16 (13.9)
Middle, No. (%)	28 (20.7)	34 (29.5)
Distal, No. (%)	74 (54.8)	65 (56.5)
Stone diameter, mm	9.6±2.4(8-16)	9.2±2.1 (7-14)
Number of stones, n	1.2±0.4	1.2±0.1
Duration of stone impaction
< 2 months, No. (%)	109 (80.7)	96 (83.4)
> 2 month, No. (%)	26 (19.2)	19 (16.5)

Abbreviation: TUL, transurethral lithotripsy.

P ≥ 0.05.