dCROX and ROX Indices Predict Clinical Outcomes in Patients with COVID-19 Pneumonia Treated with High-Flow Nasal Cannula Oxygen Therapy

Table 2

Cutoff values of dCROX and ROX indices for predicting successful weaning from high-flow nasal cannula treatment.

Index	Cutoff value	AUC	95% CI	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	value
dCROX (7 days^a)	3.78	0.59	0.48–0.69	57.9	57.4	43.1	71.0	<0.001
dCROX (14 days^b)	3.15	0.71	0.60–0.81	66.2	70.7	78.2	57.0	<0.001
ROX (14 days^b)	9.13	0.79	0.69–0.88	75.4	78.0	84.5	66.7	<0.001

^aSuccessful weaning from high-flow nasal cannula treatment within 7 days. ^bSuccessful weaning from high-flow nasal cannula treatment within 14 days. AUC = area under the ROC curve, CI = confidence interval, NPV = negative predictive values, and PPV = positive predictive values.