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Table 2 Normal values for kidney length pole to pole, cortical and parenchymal width, classified according to the side of the kidney, and gender

From: Normal kidney size and its influencing factors - a 64-slice MDCT study of 1.040 asymptomatic patients

   Mean Median 95% Confidence interval of mean SD 2% Percentile 10% Percentile 90% Percentile 98% Percentile Wilcoxon test
   (mm) (mm) Lower Upper (mm) (mm) (mm) (mm) (mm) p value
Women Kidney length right side 103.8 104 102.8 104.9 11.1 79.6 90.31 117.9 128.0 <0.0001
  Kidney length left side 106.3 106 105.3 107.4 11.5 82.5 92.12 121.9 130.9  
  Parenchymal width right 14.5 14.4 14.3 14.7 2.6 8.9 14.26 14.74 20.4 <0.0001
  Parenchymal width left 15 14.8 14.7 15.2 2.4 10.7 12.3 18.4 20.2  
  Cortical width right side 6.2 6.1 6.1 6.3 1.3 3.8 4.6 8.2 9.4 ns
  Cortical width left side 6.2 6.2 6.1 6.3 1.2 3.7 4.7 7.7 8.6  
  Width right (axial planes) 48 47.2 47.3 48.6 7.2 34.9 40.2 57.6 65.2 <0.0001
  Width left (axial planes) 49.4 49.3 48.7 50.1 7.4 35.8 40.6 58.1 67.6  
  Length right (axial planes) 55.8 55.8 55 56.6 7.9 39.5 46.8 64.6 73.9 <0.0001
  Length left (axial planes) 51.2 50.8 50.4 52.1 8.3 35.6 42 61.9 71.5  
  Width of the pyelon (right side) 16.9 16.1 16.4 17.4 5.7 7.5 10.3 11.5 31.3 <0.0001
  Width of the pyelon (left side) 18.0 17.1 17.5 18.5 5.6 9.1 24.6 26.0 30.9  
  Parenchym/pyelon ratio (right side) 1.0 0.9 0.9 1.0 0.4 0.4 0.6 1.4 1.8 = 0.0215
  Parenchym/pyelon ratio (left side) 0.9 0.9 0.9 1.0 0.6 0.4 0.5 1.3 1.8  
Men Kidney length right side 112.0 112.0 111.1 113.0 11.6 87.8 99.0 126.0 136.4 <0.0001
  Kidney length left side 114.9 115.0 113.9 115.9 12.0 88.0 100.0 130.0 140.0  
  Parenchymal width right 16.3 16.1 15.9 16.4 2.7 10.4 12.9 19.5 21.8 = 0.0002
  Parenchymal width left 16.5 16.4 16.3 16.7 2.4 11.3 13.2 19.8 22.3  
  Cortical width right side 6.8 6.7 6.7 7.0 2.2 3.9 5.0 8.6 10.2 = 0.0470
  Cortical width left side 7.0 6.9 6.8 7.2 2.7 4.3 5.0 8.8 10.1  
  Width right (axial planes) 53.9 53.4 53.3 54.5 7.2 39.7 45.4 63.0 70.2 <0.0001
  Width left (axial planes) 56.4 56.3 55.8 57.4 7.5 42.1 47.4 65.6 73.1  
  Length right (axial planes) 59.3 58.9 58.5 60.0 7.9 44.5 50.0 69.0 78.0 <0.0001
  Length left (axial planes) 55.5 54.5 54.8 56.3 8.0 39.6 45.9 66.5 74.4  
  Width of the pyelon (right side) 19.7 18.7 19.1 20.2 19.7 8.3 12.5 28.0 35.06 <0.0001
  Width of the pyelon (left side) 21.5 20.7 20.9 22.0 21.5 9.6 13.8 30.7 35.1  
  Parenchym/pyelon ratio (right side) 0.9 0.8 0.9 1.0 0.5 0.4 0.5 1.4 2.0 <0.0001
  Parenchym/pyelon ratio (left side) 0.9 0.8 0.8 0.9 0.4 0.4 0.5 1.3 1.8