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Table 2 Comparisons between negative and positive lymph nodes for 12 CT measurements

From: Computed tomography Hounsfield units can predict breast cancer metastasis to axillary lymph nodes

  Lymph node metastasis
Factors (mean ± SD) Negative (n = 82) Positive (n = 49) P
Mean NC-CT HU of lymph node 7.83 ± 22.31 29.17 ± 16.37 < 0.05
Maximum NC-CT HU of lymph node 34.28 ± 23.58 60.06 ± 17.52 < 0.05
Mean CE-CT HU of lymph node 52.45 ± 27.29 78.09 ± 22.49 < 0.05
Maximum CE-CT HU of lymph node 86.95 ± 27.58 118.63 ± 23.14 < 0.05
Mean NC-CT HU of primary tumor 36.09 ± 18.88 37.28 ± 16.58 0.89
Maximum NC-CT HU of primary tumor 69.30 ± 30.65 78.17 ± 18.55 0.11
Mean CE-CT HU of primary tumor 91.92 ± 28.36 89.03 ± 31.45 0.39
Maximum CE-CT HU of primary tumor 135.81 ± 31.27 148.88 ± 25.32 0.88
Long-axis diameter of lymph node (mm) 6.05 ± 2.32 10.37 ± 4.75 < 0.05
Short-axis diameter of lymph node (mm) 4.42 ± 1.71 7.35 ± 3.39 < 0.05
Long-axis diameter of primary tumor (mm) 18.71 ± 10.14 40.54 ± 37.94 < 0.05
Short-axis diameter of primary tumor (mm) 12.99 ± 7.11 25.44 ± 33.37 < 0.05
  1. CE-CT: contrast-enhanced computed tomography; HU: Hounsfield unit; NC-CT: non-contrasting computed tomography; SD: standard deviation.