Table 2 Baseline characteristics of patients whose stones were located 31–90 mm from the UPJ

All patients. no

72

67

Gender, no. Male/Female

48/24

53/14

0.128

Age, years, mean ± SD,

median [range]

52.0 ± 15.1, 51

[27–88]

47.5 ± 12.9, 48

[22–76]

0.065

BMI, mean ± SD,

median [range]

24.9 ± 3.1, 24.9

[17.6–33.0]

25.3 ± 4.4, 24.5

[14.2–37.3]

0.589

Hydronephrosis grade, no. Mild/Moderate/Severe

45/17/10

31/28/8

0.070

Stone laterality (L/R), no

10/15

6/8

1.000

Stone size, mean ± SD

median [range]

 Length (mm)

10.3 ± 3.4, 10

[5–25]

12.5 ± 5.5, 11

[5–36]

0.006

 Width (mm)

6.8 ± 2.0, 7

[3–15]

7.4 ± 2.1, 7

[4–11]

0.101

 Burden (mm²)

58.0 ± 33.4, 51.8

[14.1–212.0]

78.3 ± 54.3, 64.4

[15.7–310.9]

0.010

 Density (HU)

1207.2 ± 307.8, 1239

[420–1815]

1239.8 ± 319.7, 1323

[451–1738]

0.617

Operation time (min),

mean ± SD, median [range]

40.2 ± 18.4, 35.5

[10–84]

44.5 ± 27.8, 36.5

[14–150]

0.304

Intraoperation complications

0

0

–

Postoperative stay (days),

mean ± SD, median [range]

4.3 ± 1.3, 4

[1–8]

4.2 ± 2.1, 4

[2–13]

0.710

Post-fever, no

3

3

1.000

Post-sepsis, no

3

1

0.621

Total expense (¥),

mean ± SD, median [range]

20,303.1 ± 5832.4, 20,071.3

[10040.0 ± 45,145.0]

26,204.7 ± 12,106.7, 24,280.1

[5912.0 ± 87,707.0]

0.001

SFR (%)

 One-day

84.7

89.6

0.455

 One-month

84.7

95.5

0.047