Figure 1

AUROC for HACOR and ROX scores in predicting the final composite outcome (requirement of endotracheal intubation or death by COVID19) after 2 h of High flow nasal cannula. ROX ROC: 0.72 sensitivity 62% specificity 65% CI 0.66–0.79. HACOR ROC: 0.71 sensitivity 66% specificity 65% CI 0.65–0.78.