The goal of this observational study is to learn about the long-term outcomes of children and young people who underwent an 18-month course of oral immunotherapy (OIT) treatment for peanut, egg or milk allergy. It aims to: • Compare long-term changes in health-related quality of life (HRQL) at 5-15 years after stopping OIT in participants who achieved remission and those who did not. Participants will attend a single follow-up visit for: * A blood test * Skin prick test (SPT) * Allergy questionnaires
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Changes in health-related quality of life (HRQL) scores from baseline to 5-15 years after stopping oral immunotherapy (OIT) in individuals who achieved remission and those who did not, as measured by Food Allergy Quality of Life Questionnaires (FAQLQ).
Timeframe: A single study visit (approximately 2 hours) will be conducted at 5-15 years after the participant completed OIT in their parent study.