Table 1 Comparison of demographic and stone-related factors in the three study groups

Age

38.2

37.9

39.9

0.9

Gender: men/women

40/10

35/15

26/7

0.46

Location of stone:

   Upper pole

9

8

5

   Lower pole

5

11

6

   UPJ

11

8

11

0.86

   Ureter

25

23

11

Single stone (%)

37

38

24

0.94

Size of stone (mean) (mm)

11

9

11

0.13

Stone size:

   < 10 mm

32

42

24

0.65

   11–20 mm

14

7

7

0.87

   > 20 mm

4

1

2

0.63