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Table 3 Area under the receiver operating characteristic curve (AUROC) of the parameters at 1, 2, and 6 h in predicting high-flow nasal cannula success or failure

From: ROX index versus HACOR scale in predicting success and failure of high-flow nasal cannula in the emergency department for patients with acute hypoxemic respiratory failure: a prospective observational study

Parameter

AUROC

p-value

95% confidence interval

Lower bound

Upper bound

Prediction of HFNC success

 ROX at 1 h

0.815

 < 0.001

0.690

0.940

 ROX at 2 h

0.784

 < 0.001

0.629

0.939

 ROX at 6 h

0.853

 < 0.001

0.756

0.950

 SF at 1 h

0.708

0.004

0.565

0.850

 SF at 2 h

0.662

0.049

0.500

0.824

 SF at 6 h

0.764

 < 0.001

0.638

0.889

Prediction of HFNC failure

 HACOR at 1 h

0.733

0.003

0.578

0.887

 HACOR at 2 h

0.690

0.036

0.512

0.868

 HACOR at 6 h

0.702

0.032

0.517

0.886

 RR at 1 h

0.773

 < 0.001

0.630

0.915

 RR at 2 h

0.754

0.001

0.599

0.908

 RR at 6 h

0.842

 < 0.001

0.722

0.963

  1. Abbreviations: HFNC High-flow nasal cannula, SF Pulse oximetry/fraction of inspired oxygen ratio, RR Respiratory rate