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Table 2 ROC curve analysis describing the sensitivity, specificity, negative-and positive-predictive values for ICU admission and mechanical ventilation at different cut-off levels.

From: C-reactive protein serum levels as an early predictor of outcome in patients with pandemic H1N1 influenza A virus infection

ICU
Serum CRP (mg/L) cut-off level Sensitivity Specificity PPV NPV
33 100 42 14 100
39 94 49 15 99
60 88 63 19 98
64 82 68 20 98
75 77 72 21 97
98 71 81 27 97
112 59 83 25 95
123 53 86 27 95
149 47 90 32 95
Mechanical ventilation
Serum CRP (mg/L) cut-off level Sensitivity Specificity PPV NPV
33 100 40 7 100
39 88 46 7 99
64 75 65 9 98
102 63 79 11 98
123 50 84 12 98
164 38 91 16 97
  1. PPV, positive predictive value, NPV, negative predictive value