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Table 4 ROC curves of MPV, leukocyte and CRP

From: Mean platelet volume is useful for predicting weaning failure: a retrospective, observational study

Characteristics MPV, fl Leukocyte, × 10.9/L CRP,mg/L
Cutoff value  > 11.3  > 8.9  > 67
Sensitivity, % 55.56 72.22 57.41
Specificity, % 87.92 50.24 65.7
Positive predictive value, % 54.5 27.5 30.4
Negative predictive value, % 88.3 87.4 85.5
Diagnostic accurary, % 81.22 51.7 63.9
Likehood ratio of positive test 4.6 1.45 1.67
Likehood ratio of negative test 0.51 0.55 0.65
Youden's index 0.43 0.22 0.23
AUC 0.777 0.6 0.627
95% CI 0.722–0.826 0.538 -0.66 0.565–0.685
P  < 0.0001 0.0236 0.0014
  1. Abbreviation: AUC Area Under the Curve, CI Confidence Interval, MPV Mean Platelet Volume, CRP C-reactive Protein, ROC Receiver-operating Characteristic