Figure 1

Receiver operating characteristic (ROC) curves for the prediction of 28-day survival. (a) ROC curve of the vasopressor dependency index (VDI). The optimal cutoff point is represented as an open circle. The area under the curve (95% confidence interval) and optimal cutoff points (sensitivity, specificity) of the vasopressor dependency index were 0.768 (0.514–1.000) and 0.499/mmHg (78.3%, 83.3%), respectively. (b) ROC curve of the leukocyte count. The optimal cutoff point is represented as an open circle. The area under the curve (95% confidence interval) and optimal cutoff points (sensitivity, specificity) of the leukocyte count were 0.804 (0.551–1.000) and 1360/μL (100%, 66.7%), respectively. (c) ROC curve of base excess (BE). The optimal cutoff point is represented as an open circle. The area under the curve (95% confidence interval) and optimal cutoff points (sensitivity, specificity) of base excess were 0.866 (0.647–1.000) and −6.4 mmol/L (95.7%, 83.3%), respectively.