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Table 2 Risk factors for residual stones

From: Application of a new position in endoscopic combined intrarenal surgery: modified prone split-leg position

Variables

SF (n = 75)

Non-SF (n = 21)

p

Age (years)

56.1 ± 9.1

52.8 ± 14.8

0.51

BMI (kg/m2)

24.2 ± 3.4

24.6 ± 1.7

0.69

Sex

   

 Male

41

10

0.57

 Female

34

11

 

Side

   

 Right

43

11

0.69

 Left

32

10

 

Renal stone size (mm)

31.8 ± 11.1

35.1 ± 9.3

0.39

Renal stone surface area (mm2)

677.1 ± 261.8

838.7 ± 247.6

0.09

CT (HU)

1064.4 ± 302.6

1025.2 ± 309.9

0.72

Stone analysis

   

 Calcium oxalate

54

15

0.96

 Non calcium oxalate

21

6

 

Number of calyces involved by stone

   

 < 3

38

4

0.01

 ≥ 3

37

17

 
  1. BMI body mass index, CT computed tomography, HU hounsfield unit, SF stone free