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Flohrs, K. ; Brüske, I. ; Thiering, E. ; Rzehak, P. ; Wichmann, H.-E. ; Heinrich, J.

Temporal changes in total serum immunoglobulin E levels in East German children and the effect of potential predictors.

Int. Arch. Allergy Immunol. 158, 27-34 (2012)

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Background: Elevated total serum immunoglobulin E (IgE) levels are a prominent feature of allergic and parasitic diseases. An epidemiologic study was conducted in East German children to describe trends in the development of total serum IgE levels and analyze the impact of potential determinants. Methods: The study consisted of three cross-sectional surveys in 1992-1993, 1995-1996 and 1998-1999 and was conducted in three areas of the former German Democratic Republic. In total, 8,051 questionnaires were completed by the parents of children aged 5-14 years, supplying information on allergic symptoms and potential risk factors. A total of 5,918 measurements of total serum IgE and specific IgE to 5 common aeroallergens were available from 4,353 schoolchildren. Generalized estimating equations were applied to data from all children and stratified for atopic and nonatopic children to identify trends and estimate the effect of potential determinants on total IgE. Results: Total serum IgE levels decreased significantly with a linear trend in East German schoolchildren between 1992 and 1999, the effect being stronger in nonatopic children. The following factors were associated with lower total serum IgE levels: female gender, living in a household with fewer than 4 people, no history of helminth infestation, younger age group (5-7 years), no parental allergy and high socioeconomic status. No association was seen for 'smoking at home' and close contact to pets. Conclusion: Total serum IgE declined parallel to helminth infestation; however, the latter explained the decrease only in part. Furthermore, total IgE developed in an opposite direction to specific IgE, indicating that it has determinants other than allergic sensitization.

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