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Table 1 Analysis of preoperative 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)
Count (123) 40 32.5 45 36.6 34 27.6 4 3.3  
Gender, % 0.0001
Male (71) 29 72.5 34 75.5 8 23.5 0 0
Female (52) 11 ‬27.5‬ 11 24.5 26 76.5 4 100
Age (mean ± SD) 39.07 ± 13.94   44.04 ± 9.71   48.17 ± 9.18   52.50 ± 1.73   0.005
Body Mass Index (kg/m2) median(range) 23.8 (21.7–29.4)   27.7 (25–29.7)   33.4 (30–38.8)   42.1 (40.5–43.7)   0.0001
Comorbidity 0.224
 HTN (9) 3 7.5 2 4.45 2 5.88 2 50
 DM (6) 2 5 4 8.89 0 0 0 0
 HTN + DM (7) 0 0 2 4.45 5 14.7 0 0
(mean ± SD) 2.1 ± .12   2.4 ± .4   2.3 ± .15   2.4 ± .34   0.378
Stones Localization 0.184
 1 OR 2 Calyces (86) 30 75 32 71.2 20 58.8 4 100
 Multiple calyces (18) 8 20 4 8.8 6 17.6 0 0
 Stag horn (19) 2 5 9 20 8 23.5 0 0
Side 0.001
 Left (64) 15 37.5 19 42.3 28 82.3 2 50
 Right (59) 25 62.5‬ 26 57.7 6 17.7 2 50
Hydronephrosis 0.146
 (None, mild) (82) 28 70 25 55.5 25 73.5 4 100
 (Moderate, Severe) (41) 12 30 20 44.5 9 26.5 0 0
Essence’ (HU)          0.020
 Non- opaque(43) 21 52.5 12 26.6 8 23.5 2 50
 Opaque(80) 19 ‬47.5‬ 33 73.4 26 76.5 2 50
  1. P < 0.05 are in italics