Table 3 Baseline characteristics of patients whose stones were located > 90 mm from the UPJ

All patients. no

22

14

Gender, no. Male/Female

19/3

13/1

1.000

Age, years, mean ± SD,

median [range]

51.0 ± 14.4, 50.5

[27–86]

46.7 ± 12.3, 50.5

[25–64]

0.390

BMI, mean ± SD,

median [range]

24.8 ± 3.5, 24.0

[15.6–31.2]

24.0 ± 1.9, 23.7

[21.5–26.7]

0.482

Hydronephrosis grade, no. Mild/Moderate/Severe

11/6/5

9/4/1

0.457

Stone laterality (L/R), no

10/15

6/8

1.000

Stone size, mean ± SD

median [range]

 Length (mm)

12.2 ± 3.9, 12

[5–20]

11.0 ± 3.3, 12

[4–15]

0.351

 Width (mm)

7.5 ± 2.3, 8

[3–11]

6.5 ± 1.6, 6

[3–9]

0.163

 Burden (mm²)

75.4 ± 35.6, 75.4

[11.8–141.3]

58.4 ± 24.2, 63.6

[9.4–91.9]

0.127

 Density (HU)

1266.3 ± 266.8, 1330.5

[775–1630]

1149.9 ± 237.6, 1157

[782–1530]

0.300

Operation time (min),

mean ± SD, median [range]

38.1 ± 19.8, 35

[14–90]

46.3 ± 13.1, 44

[25–67]

0.210

Intraoperation complications

0

0

–

Postoperative stay (days),

mean ± SD, median [range]

3.8 ± 1.5, 3

[2–7]

3.7 ± 1.4, 3.5

[1–6]

0.841

Post-fever, no

0

0

–

Post-sepsis, no

0

0

–

Total expense (¥),

mean ± SD, median [range]

19,389.6 ± 4841.9, 19,365.4

[12,566.0 ± 27,265.0]

24,127.0 ± 4938.1, 24,621.7

[16,076.0 ± 32,041.0]

0.011

SFR (%)

 One-day

100.0

100.0

–

 One-month

100.0

100.0

–