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Table 3 Analysis of postoperative 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   
Hospitalization duration (days) 0.014
 Median(range) 4 (3–5)   4 (3–10)   4 (3–7)   5.5 (4–7)   
Hemoglobin drop (g/dl) 0.094
 Median(range) .95 (0–2)   1 (0–4)   1.05 (1–4)   .95 (1–4)   
Postoperative complications 0.833
 Anemia(4) 2 5 2 4.4 0 0 0 0  
 Leakage < 24 h(9) 3 7.5 3 6.7 3 8.8 0 0  
 Persistent leakage > 24 h(2) 0 0 0 0 2 5.8 0 0  
 Colonic injury(1) 1 2.5 0 0 0 0 0 0  
Postoperative DJ insertion (8) 4 10 2 4.4 2 5.8 0 0 0.704
Fate of residual stones 0.366
 ESWL(10) 7 17.5 1 2.2 2 5.8 0 0  
 2nd look(8) 0 0 2 4.4 6 17.6 0 0  
 Open surgery(2) 0 0 2 4.4 0 0 0 0  
 Follow-up (2) 1 2.5 1 2.2 0 0 0 0  
Results 0.623
 Number of patients with residual stones(22) 7 17.5 7 15.5 8 23.5 0 0  
 Number patients with stone-free status(101) 33 82.5 38 84.5 26 76.5 4 100  
  1. P < 0.05 are in italics