Table 1 Clinical characteristics of kidney stone formers

Age at first stone episode, years

35 (15–67)

Number of stone episodes

  2-4, N (%)

70 (36)

  5-10, N (%)

41 (21)

  >10, N (%)

84 (43)

Stone type (number of patients)

 Radiopaque stones, N (%)

154 (79)

  Calcium oxalate

    Idiopathic, N

55

    Hemicolectomy/gastric bypass, N

5

  Calcium phosphate

    Idiopathic, N

7

    Primary hyperparathyroidism, N 

3

  Unknown, N

84

 Radiolucent stones, N (%)

20 (10)

  Uric acid, N

13

  2,8-Dihydroxyadenine, N

2

  Unknown, N

5

 Not determined, N (%)

21 (11)

ESWL, N (%)

131 (67)

Insertion of ureteral catheter, N (%)

84 (43)

Stone removal surgery, N (%)

10 (5)

 Percutaneous, N

8

 Open, N

2