Table 2.

Receiver operating characteristic curve analysis.

Variable	AUC	95% CI	P value
Serum IgG1	0.7917	0.626–0.958	0.1147*
Serum IgG4	0.9127	0.802–1.024
Serum IFN-α	0.9306	0.831–1.030	0.8149*
Serum IL-33	0.9087	0.806–1.012	0.9598*

Cut-off point	Sensitivity (%)	Specificity (%)
Serum IgG1 > 1054 mg/dL	71.4	75
Serum IgG4 > 182 mg/dL	85.7	91.7
Serum IFN-α > 55 pg/mL	85.7	91.7
Serum IL-33 > 274 pg/mL	85.7	83.3

CI, confidence interval; AUC, area under the curve.

*Statistical differences comparing serum IgG4 AUC and those for serum IgG1, IFN-α, and IL-33.