The aims of the present study were to assess the effects of maternal use of domestic chemicals during pregnancy on wheezing and lung function in children aged 30 months) wheezing in nonatopic children (adjusted odds ratio per z-score of CHCE (95% confidence interval) 1.41 (1.13-1.76), 1.43 (1.02-2.13) and 1.69 (1.19-2.41), respectively). Increasing CHCE score was associated with decrements in FEV(1) and FEF(25-75%). Higher domestic chemical exposure during pregnancy was associated with persistent wheeze and lung function abnormalities in nonatopic children. This may result from pre-natal developmental effects or post-natal irritant effects on the developing airway, but is unlikely to be mediated through increased hygiene in the home.
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