Table 2. Sensitivity, Specificity, Negative Predictive Value (NPV), Positive Predictive Value (PPV) and Accuracy for (a) Highest MEWS ≥ 2, and highest MEWS ≥ 3 in any 24 hours; (b) Mean daily MEWS ≥ 1, Mean daily MEWS > 1, and the “optimal” mean MEWS ≥ 1.125 and mean MEWS ≥ 1.625 as calculated from ROC in Figure 1.