Serum Carbohydrate Antigen 199 as a Biomarker for Evaluating Patients with Choledocholithiasis

Table 4

Area under the curve.

Test result variable(s)	Area	Asymptotic sig.^b	Asymptotic 95% confidence interval		Cutoff value	Specificity	Sensitivity
			Lower bound	Upper bound
WBC	0.685	0.000	0.594	0.775	8.9	0.688	0.655
Ca199	0.977	0.000	0.953	1.000	59.54	0.935	0.931

The test result variable(s): WBC has at least one tie between the positive actual state group and the negative actual state group. Statistics may be biased. ^aUnder the nonparametric assumption. ^bNull hypothesis: .