Fig. 2From: Why the C-statistic is not informative to evaluate early warning scores and what metrics to useGraphic representations of the proposed metrics and the ROC curves for all cutoff values of two sample scores (EWS). a, b, c Three proposed metrics for the two sample scores. d ROC curves which we suggest not using. Each point in the graphs corresponds to a threshold of a specific score. Points A and B are referred to in the text. AUROC area under the receiver operator characteristics, EWS early warning score, NNE number needed to evaluate, PPV positive predictive valueBack to article page