The authors sought to determine whether certain atopic features, sociodemographic characteristics, and lifestyle habits were associated with childhood food allergy.

Through randomized telephone calls, study participants were asked to complete a questionnaire if they had a history of food allergy (cow’s milk, egg, peanut, tree nuts, fish, shellfish, wheat, soy, or sesame). Controls were age-matched, nonallergic individuals either living in the same household or randomly selected.

This was a case-controlled study nested within the SPAACE study (Surveying Prevalence of food Allergy in All Canadian Environments). A random telephone sampling of families were called between September 2010 and September 2011. Cases and controls were matched to 3 age groups: <5 years, 5 to 17 years, and >18 years of age. They aimed to have a ratio of at least 1:4 between cases and controls for each of 3 matched groups. Questionnaires looked at atopic history, sociodemographic patterns, and lifestyle habits.

Four...

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