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Table 2 Analysis of intra-operative variables

From: Impact of weight on stone-free rate during percutaneous nephrolithotomy

  Group 1 (%) Group 2 (%) Group 3 (%) Group 4 (%) P-value
Average (< 25) Overweight (25–29.9) Obese (30–39.9) Morbid obese (> 40)
Patients count(123) 40   45   34   4   
Operative time(min) Median(range) 46 (41–213)   53 (41–220)   61 (42–215)   45 (43–55)   0.034
Fluoroscopy time(minutes) Median(range) 5 (3.8–20)   5.30 (4.30–20)   9 (5.8–17)   12 (6–13)   0.0001
Number of access 0.134
 1 (86) 31 77.5‬ 31 68.9 20 58.8 4 100  
 2 (17) 7 17.5‬ 4 8.8 6 17.7 0 0  
 3 (20) 2 5 10 22.3 8 23.5 0 0  
Access site 0.066
 Multiple (21) 4 10 5 11.1 11 32.4 1 25  
 Upper calyces (2) 1 2.5 0 0 1 .95 0 0  
 Middle calyces (13) 2 5 8 17.8 3 8.8 0 0  
 Lower calyces (87) 33 82.5 32 71.1 19 55.9 3 75  
  1. P < 0.05 are in italics