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Table 1 Basic information and stone characteristics of the patients (n = 30)

From: One-stage tubeless percutaneous nephrolithotomy for asymptomatic calculous pyonephrosis

Patient Information Results
Age (years, mean ± SD) 53.8 ± 11.8
Gender [cases, (%)]  
 Male 8/30 (26.7)
 Female 22/30 (73.3)
BMI [kg/m2, cases, (%)]  
 < 18.5 1/30 (3.3)
 18.5–24.9 14/30 (46.7)
 > 25.0 15/30 (50.0)
Underlying disease [cases, (%)]  
 None 19/30 (63.3)
 Hypertensive disease 7/30 (23.3)
 Diabetes mellitus 4/30 (13.3)
Stone location [cases, (%)]  
 Right 12/30 (40.0)
 Left 18/30 (60.0)
Type of stone [cases, (%)]  
 Solitary stone 5/30 (16.7)
 Staghorn stone 9/30 (30.0)
 Multiple stones 16/30 (53.3)
 Length of single and staghorn stone (mm, mean ± SD) 29.6 ± 10.9
 Multiple stones length diameter (mm, mean ± SD) 56.7 ± 19.1
CT values of stones [HU, cases, (%)]  
 < 800 17/30 (56.7)
 ≥ 800 13/30 (43.3)
Hydronephrosis [cases, (%)]  
 Mild 11/30 (36.7)
 Moderate 11/30 (36.7)
 Severe 8/30 (26.6)
 Preoperative blood WBC (109/L) 7.0 ± 2.5
Preoperative urine culture [cases, (%)]  
 Negative 19/30 (63.3)
 Escherichia coli 7/30 (23.3)
 Klebsiella pneumoniae 2/30 (6.7)
 Pseudomonas aeruginosa 1/30 (3.3)
 Aspergillus chimaera 1/30 (3.3)
Preoperative urine nitrite [Example, (%)]  
 Positive 8/30 (26.7)
 Negative 22/30 (73.3)
  1. BMI body mass index, CT computed tomography, SD standard deviation, WBC white blood cell