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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