Supplementary Table S1: Patient Reactions Group Allergic Allergic Allergic Allergic Allergic Allergic Allergic Allergic Allergic Allergic Allergic Allergic Allergic Allergic Median Allergic, eats baked egg Allergic, eats baked egg Allergic, eats baked egg Allergic, eats baked egg Allergic, eats baked egg Allergic, eats baked egg Allergic, eats baked egg Allergic, eats baked egg Median Tolerant to egg Tolerant to egg Tolerant to egg Tolerant to egg Tolerant to egg Tolerant to egg Tolerant to egg Tolerant to egg Tolerant to peanut Tolerant to peanut Tolerant to peanut Median Control Control Control Control Control Control Age (Y) 7.1 7.9 3.3 8.4 5.4 11 5.1 2.1 7.2 8.2 2.6 6.7 9.3 0.9 6.9 8.75 13.2 2.2 3.5 1.2 17.6 4.3 3.5 3.9 2.7 3.2 10 4.2 10.9 11.75 6.25 4.1 5.1 7.7 7.75 6.25 1.4 12.2 8.6 8.6 4.25 15.3 Initial reaction to egg at diagnosis GI* Anaphylaxis Anaphylaxis Skin Eating ad lib Eating ad lib Eating ad lib Eating ad lib Anaphylaxis* Eating ad lib Eating ad lib Eating ad lib Anaphylaxis Skin* Initial reaction to peanut at diagnosis Preventive avoidance Skin* Preventive avoidance Preventive avoidance Anaphylaxis Anaphylaxis Skin Preventive avoidance Preventive avoidance Skin Skin Skin Anaphylaxis Eating ad lib Skin Skin Skin Skin Skin Skin Preventive avoidance Skin Anaphylaxis Anaphylaxis Eating ad lib Eating ad lib Eating ad lib Anaphylaxis GI Eating ad lib Anaphylaxis Skin Skin Anaphylaxis Anaphylaxis GI Skin Skin Eating ad lib Eating ad lib Eating ad lib Preventive avoidance Skin* Anaphylaxis Preventive avoidance Anaphylaxis Skin Eating ad lib Eating ad lib Skin Anaphylaxis Anaphylaxis Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Control 3.2 Eating ad lib Control 10.5 Eating ad lib Control 13.3 Eating ad lib Control 7.9 Eating ad lib Control 1.75 Eating ad lib Control 8.9 Eating ad lib Control 5.3 Eating ad lib Control 8.75 Eating ad lib Control 14.4 Eating ad lib Control 13.2 Eating ad lib Control 7.2 Eating ad lib Control 14 Eating ad lib Control 1.6 Eating ad lib Control 1.4 Eating ad lib Control 9.4 Eating ad lib Control 14.4 Eating ad lib Control 2.3 Eating ad lib Control 8.3 Eating ad lib Control 12.2 Eating ad lib Median 8.6 Eating ad lib *subsequently failed food challenge in clinic Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Eating ad lib Supplementary Table S2: Tolerant Patient Characteristics Group Initial Time Since Initial Reaction sIgE at sIgE at Reaction and Recruitment (Y) Diagnosis Challenge Tolerant to egg Anaphylaxis 1.8 N/A .19 Tolerant to egg Skin 2. 3 4.35 .78 Tolerant to egg Skin 7.3 11.8 1.69 Tolerant to egg Anaphylaxis 3.2 2.9 N/A Tolerant to egg Anaphylaxis 8.4 0.9 N/A Tolerant to egg GI 8 25.2 N/A Tolerant to egg Skin 5.3 N/A N/A Tolerant to egg Skin 3 .36 .1 Tolerant to peanut Skin 4.1 N/A .1 Tolerant to peanut Anaphylaxis 3.7 N/A .13 Tolerant to peanut Anaphylaxis 2.25 1.41 .17 N/A = not available. sIgE not available at diagnosis means diagnosis was made by skin prick test. If a patient passed an open challenge at home within 6 months of recruitment,sIgE was not drawn.