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Receiver operator characteristics (ROC) curve of total IgE (IU/mL): atopy vs nonatopy. On the basis of the receiver operator characteristics curve, a total IgE threshold of 79 IU/mL was adopted as the best differentiating value between people who are sensitized and non-sensitized, with 93 % specificity and 26 % sensitivity (area under the curve: 0.69)
