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Table 5 Data are expressed as AUC (area under the curve) with 95% confidence interval (CI)

From: Prognostic value of procalcitonin in patients after elective cardiac surgery: a prospective cohort study

  ROC analysis to predict delayed complications (n = 751)
AUC 95% CI p value Cutoff Likelihood ratio Sensitivity (%) Specificity (%) PPV (%) NPV (%)
Preoperative
Procalcitonin (ng/ml) 0.58 0.52–0.64 0.007 >0.05 2.32 28 88 30 87
Leukocytes (x109/l) 0.57 0.52–0.63 0.02 >9.3 1.97 27 86 27 87
C-reactive protein (mg/l) 0.60 0.54–0.65 <0.001 >11.6 2.07 27 87 28 87
Postoperative
Procalcitonin (ng/ml) 0.90 0.87–0.94 <0.001 >2.95 21.83 73 97 82 95
Leukocytes (×109/l) 0.62 0.56–0.67 <0.001 >13.7 1.82 35 81 25 87
C-reactive protein (mg/l) 0.53 0.48–0.59 0.24 >46.4 1.06 85 21 16 88
  1. Different receiver operating characteristic (ROC) curves were constructed to evaluate the predictive power for delayed complications
  2. PPV the positive predictive value, NPV the negative predictive