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Table 5 Test characteristics of the automated interpretation algorithm by sample

From: Automated identification of pneumonia in chest radiograph reports in critically ill patients

  Test characteristics by interpretation samples (%)
Dataset Sensitivity Specificity PPV NPV
  Negative-only (versus Positive or Possible)
Validation 92.7 91.1 93.3 90.3
Derivation 93.2 96.8 96.8 93.1
Overall 92.8 93.1 93.5 92.3
  Positive-only (versus Possible or Negative)
Validation 45.3 99.0 77.4 95.9
Derivation 53.3 99.0 72.7 97.7
Overall 45.0 99.0 75.8 96.3
  Possible-only (versus Positive or Negative)
Validation 86.6 87.4 79.1 92.3
Derivation 94.2 89.9 87.9 95.2
Overall 89.9 87.5 83.8 92.4
  1. PPV Positive predictive value, NPV Negative predictive value.