Table 6. ROC analysis of ALB, PCT, and their combination for identifying severe co-infection.

Variables	Area	SE	Asymptotic sig	Asymptotic 95% CI
				Lower bound	Upper bound
ALB in combination with PCT	0.720	0.048	0.000	0.627	0.814
ALB	0.704	0.050	0.000	0.606	0.802
PCT	0.704	0.044	0.000	0.618	0.790

ALB, albumin; CI, confidence interval; PCT, procalcitonin; ROC, receiver operating characteristic; SE, standard error.