Receiver operating characteristic (ROC) curve for IgE (black line), IgG
(red line), and IgE/IgG
(blue line) to determine the positivity or negativity of egg allergy. The ROC curve for IgE/IgG4 is superior to those for IgE and IgG4 levels. The AUCs for IgE, IgG4, and IgE/IgG4 for the prediction of positive results were 0.609, 0.724, and 0.847, respectively.