Table 1. Patient characteristics.

Characteristic	Value
No. of cases	270
Age (y)	55.6±14.2
Sex
Male	179 (66.3)
Female	91 (33.7)
Stone size (mm)	8.35±5.72
Laterality
Right	104
Left	118
Both	24
Location
Kidney	24 (8.9)
Upper ureter	87 (32.2)
Mid ureter	41 (15.2)
Lower ureter	118 (43.7)

Values are presented as mean±standard deviation or number (%).