Effect of early atopic sensitization in children aged 0–2 years on the development of asthma symptoms at 9–11 years of age

Background Personal genetic predisposition and early life environmental factors are important for the development of childhood asthma. We aimed to search whether egg, milk and mite sensitizations at 0–2 years old are risk factors for asthma symptoms at 9–11 years old. Methods A total of 210 wheezer children who had specific immunoglobulin (Ig) E in 2010–2012 were included in the study (followed by pediatric allergy). Patients were divided into non-atopic (group 1, n = 157) and atopic patients [groups 2–7, n = 53 (5 patients were in both group 4 and group 5)] based on sensitizations. Using the International Study of Asthma and Allergy in Childhood questionnaire, current wheeze (CW, 2nd question), exercise wheezing (EW, 7th question), and dry cough (DC, 8th question) were surveyed. Also, parental allergies, eczema at 0–2 years, current eosinophil percentage and total IgE were recorded. Results Eczema was observed as an important risk factor [CW: odds ratio (OR) = 2.83, 95% confidence interval (CI) = 1.54–5.23, P ≤ 0.001; EW: OR = 2.71, 95% CI = 1.33–5.54, P = 0.006; DC: OR = 3.03, 95% CI = 1.47–6.25, P = 0.003], whereas having no atopic sensitization at 0–2-year-old (group 1) was found as a significant protective factor for asthma at 9–11 years old (CW: OR = 0.32, 95% CI = 0.15–0.70, P = 0.004; EW: OR = 0.21, 95% CI 0.10–0.44, P ≤ 0.001; DC: OR = 0.25, 95% CI = 0.10–0.59, P = 0.002). Conclusion Early personal eczema is a significant risk factor for the development of asthma symptoms at 9–11 years old, whereas not having an allergic sensitization at 0–2 years old (group 1) is an important protective factor.