Aim: Aim of the study is to examine the hypotheses of a steeper increase in allergies and allergic sensitisations in East than in West German children between 1991 and 2000.
Method: Between 1991 and 2000 we yearly repeated cross-sectional studies (SAWO: Study on school beginners) and asked 36,645 parents about diagnoses and symptoms of allergies in their six-year old children (response: 79 %). The study was done in Leipzig, Halle, Merseburg, Magdeburg, small towns in the Altmark region, Duisburg, Essen, Köln and Borken during spring. An allergological investigation was included 1991, 1994, 1997 and 2000. Dermatologists diagnosed a prevalent atopic eczema, administered a skin prick test (n = 7,229) and blood was taken for the determination of specific IgE antibodies against common allergens (n = 7,714, RAST). Odds Ratios (OR) for trend were calculated separately for the data from East and West Germany and are given along with their 95% confidence intervals.
Results: Allergies and their symptoms (exception: atopic eczema) were less prevalent in East German children born before the reunification than in West German ones. In East as well as in West Germany bronchial asthma was diagnosed more often in 2000 than in 1991 (OR East: 2.42 [1.78-3.28] West: 2.07 [1.43-3.00]). In contrast the prevalence of atopic eczemas was more than halved between 1991 and 2000. Of all symptoms and diagnoses of allergies only hay fever and its symptoms showed an upward trend in East Germany which was steeper than the trend in West Germany (OR East: 4.41 [3.17-6.13] West: 1.74 [1.19-2.57]). This can partly be explained by a parallel trend in sensitisation against grass pollen.
Conclusion: The spatial and temporal pattern of the allergic diseases bronchial asthma, hay fever and atopic eczema in six-year old children from Germany is different. The expected steeper increase of allergies in East than in West Germany could only be shown for hay fever.
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