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Table 5 Testing set results for lymph node metastases; CT values compared with pathological findings

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

Mean NC-CT HU   Pathological findings  
   Positive Negative Total
CT Positive 9 9 18
  Negative 1 21 22
  Total 10 30 40
Sensitivity 90.0%, Specificity 70.0%, PPV 50.0%, NPV 95.5%, Accuracy 75.0%
Maximum NC-CT HU   Pathological findings  
   Positive Negative Total
CT Positive 10 7 17
  Negative 0 23 23
  Total 10 30 40
Sensitivity 100.0%, Specificity 76.7%, PPV 58.8%, NPV 100.0%, Accuracy 82.5%
Mean CE-CT HU   Pathological findings  
   Positive Negative Total
CT Positive 7 13 20
  Negative 3 17 20
  Total 10 30 40
Sensitivity 70.0%, Specificity 56.7%, PPV 35.0%, NPV 85.0%, Accuracy 60.0%
Maximum CE-CT HU   Pathological findings  
   Positive Negative Total
CT Positive 8 12 20
  Negative 2 18 20
  Total 10 30 40
Sensitivity 80.0%, Specificity 60.0%, PPV 40.0%, NPV 90.0%, Accuracy 65.0%
  1. Diagnosis of metastasis through CT HU values.
  2. CE-CT: contrast-enhanced computed tomography; HU: Hounsfield unit; NC-CT: non-contrasting computed tomography; NPV: negative predictive value; PPV: positive predictive value.