Table 1 Demographics, clinical characteristics, and postoperative outcomes

Number

101

131

Age (year)^a

57.2 (13.7)

55.2 (12.7)

Sex

Male

65 (64.4)

96 (73.3)

Female

36 (35.6)

35 (26.7)

Post-menopausal women

28 (80.0)

29 (80.6)

Body mass index (kg/m²)^a

27.1 (5.8)

26.2 (4.2)

Diabetes

18 (17.8)

24 (18.3)

Hypertension

43 (42.6)

41 (31.3)

Chronic kidney disease

2 (2.0)

0 (0)

Laterality

Right

38 (37.6)

59 (45.0)

Left

60 (59.4)

72 (55.0)

Bilateral

3 (3.0)

0 (0)

Number of stones

1

94 (93.1)

123 (93.9)

2

7 (6.9)

4 (3.1)

3

0 (0)

3 (2.3)

4

0 (0)

1 (0.8)

Mean size of stones (mm)^a

9.0 (4.6)

7.5 (3.8)

Size of the largest stone (mm)^a

9.1 (4.6)

7.6 (3.8)

Location of the largest stone

Renal pelvis

3 (3.0)

4 (3.1)

Upper third ureter

54 (53.5)

48 (36.6)

Middle third ureter

19 (18.8)

27 (20.6)

Lower third ureter

16 (15.8)

35 (26.7)

Ureterovesical junction

9 (8.9)

17 (13.0)

Operation time (min)^a

57.6 (23.4)

48.1 (23.0)

Postoperative double pigtail stent insertion

98 (97.0)

122 (93.1)

Postoperative stone free

93 (92.1)

118 (90.1)

Postoperative febrile urinary tract infection

1 (1.0)

1 (0.8)

Postoperative emergency visit

3 (3.0)

9 (6.9)