Table 6. Receiver operating characteristic curve analysis on cortisol to predict mortality among COVID-19-positive patients.

Parameter	Cutoff point	AUC	Sensitivity	Specificity	PPV	NPV
Cortisol	31 μg/dl (855 nmol/l)	0.932	59%	95%	57%	95%

AUC = area under the curve; PPV = positive predictive value; NPV = negative predictive value.