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The purpose of this study was to determine whether the presence of serum specific immunoglobulin E (IgE) antibodies was associated with increased bronchial responsiveness in adults. We studied cross-sectionally a random community sample of 18-73 year old adults, of whom 83% (n = 489) performed bronchial responsiveness testing as well as serum measurements of five specific IgE antibodies. In the crude data, 39% of those with house dust mite antibodies (n = 18) had a bronchial responsiveness &lt; or = 32 g.L-1 methacholine compared with 19% in subjects without any of the five specific IgE antibodies (n = 453). The corresponding percentages for subjects with timothy antibodies (n = 16) was 25%, birch antibodies (n = 13) 23%, cat antibodies (n = 10) 40% and mould antibodies (n = 2) 50%. When assessing the multivariate relationship between the presence of one specific IgE antibody and degree of bronchial responsiveness we used a semi-proportional hazards model with the response as a 20% fall in forced expiratory volume in one second (FEV1) from pretest value. Covariates included in the model were: gender, age, pretest FEV1, smoking habits, pack-years, season and other specific IgE antibodies than that examined. The presence of house dust mite antibodies was a significant predictor (p &lt; 0.01) of increased bronchial responsiveness in never- and ex-smokers. Indoor allergic sensitization (house dust mite, cat and mould) was a significant predictor of increased bronchial responsiveness, while outdoor allergic sensitization (timothy and birch) was not. Excluding subjects with obstructive lung disease (n = 39) or including the covariate log total serum IgE as a potential confounder yielded the same result. Thus, in this community, indoor allergic sensitization rather than allergic sensitization per se was related to increased bronchial responsiveness after adjusting for other relevant covariates.

Serum house dust mite antibodies: predictor of increased bronchial responsiveness in adults of a community