FIGURE 2.

Ferritin ROC for intubation. A, The ROC for presentation ferritin in predicting intubation is shown. The AUC for this ROC was 0.681, consistent with a poor discriminating ability for prediction of intubation. Optimal Cutoff Ferritin was 619, with performance characteristics at the optimal cutoff of Sensitivity 0.705, Specificity 0.518, PPV 0.371, & NPV 0.813. B, The ROC for maximum ferritin in predicting intubation is shown. The AUC for this ROC was 0.769, consistent with a minimally effective discriminating ability for prediction of intubation. Optimal Cutoff Ferritin was 1014, with performance characteristics at the optimal cutoff of Sensitivity 0.793, Specificity 0.583, PPV 0.446, & NPV 0.869. AUC, area under the curve; Max, maximum; ROC, receiver operator curve