ROC analyses of performed tests using cow’s milk DBPCFC and PR OFC as gold standards.

Allergen short names are as in Table 1.DBPCFC: Double blind placebo controlled food challenge;OFC: Open food challenge;PR: Parmigiano-Reggiano;*Fresh cow’s milk tested by skin prick-prick technique;°Cow’s milk extract tested by skin prick test;§Criteria for applied tests are reported depending on specific test units: Total IgE = IU/l; Skin prick test = mm2; IgE by ImmunoCAP and ISAC = kUa/l;+LR: Positive likelihood ratio; −LR: Negative likelihood ratio; NPV: Negative predictive value;PPV: Positive predictive value.