Table 1.

Patient and stone demographics

Mean pt age (range)	53.2	(3–90)
No. gender (%):
M	358	(46.1)
F	418	(53.9)
Unilat stones:
No. pts	590
No. rt side	252
No. lt side	338
No. size greater than 2 cm (%)	476	(61.3)
No. size less than 2 cm (%)	107	(13.8)
No. size not recorded	2
Bilat stones:
No. pts	186
No. size greater than 2 cm (%)	162	(20.9)
No. size less than 2 cm (%)	22	(2.8)
No. size not recorded	7