TABLE 1

Standard 2×2 Epidemiology Table

Clinical testsProof of disease (i.e., surgery)
Disease presentDisease not present
Positive clinical testTP (32)FP (4)
Negative clinical testFN (1)TN (8)
  •  Sensitivity = TP/TP + FN

  •  Specificity = TN/TN + FP

  •  Positive predicative value = TP/TP + FP

  •  Negative predicative value = TN/TN + FN