CRP and infection: For the prediction of an infection, the AUC (Area Under the Curve) of MDW, obtained by the ROC curve analysis, was 0.839 (95% CI 0.82–0.86) which was the second highest after the AUC of CRP [0.894 (95% CI 0.88–0.91)], followed by that of PCT [0.826 (95% CI 0.77–0.88)] and WBC [0.685 (95% CI 0.65–0.72)].