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Table 1 Comparison between APACHE II, APACHE IV and PCT

From: Procalcitonin: a prognostic marker for critically ill

  APACHE II APACHE IV PCT
Area under the curve 0.66 0.693 0.63
Cutoff value 17 57.5 0.93
Sensitivity 64 71.6 73.6
Specificity 62.4 57.4 57.6
Positive predictive value 41.95 41.41 41.84
Negative predictive value 80.33 82.78 84.04