Résumé :
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[BDSP. Notice produite par INIST 18kLgR0x. Diffusion soumise à autorisation]. The impact of summertime haze episodes on daily variations in symptoms and peak expiratory flow rates (PEFRs) was examined in a study of 108 children living in State College, Pennsylvania, during the summer of 1991. Twice daily, each child recorded symptoms, PEFRs, and hours spent outdoors. Environmental measurements included daily 12-and 24-hour averages for meteorologic and air pollutant variables and 24-hour average fungus spore concentrations. A 10,000-spore/m3 increment in Cladosporium spore concentration was associated with a deficit in morning PEFR (-1.0 liters/minute, 95% confidence interval (Cl) - 1.9 to - 0.2). A 60-spore/m3 increment in Epicoccum spore concentration was associated with increased incidence of morning cough (odds ratio (OR)=1.8,95% CI 1.0-3.2) and a deficit in morning PEFR (-1.5 liters/minute, 95% CI - 2.8 to - 0.2). Fungi spore counts were not associated with respirable particle mass. A 125-nmol/m3 increment in 12-hour daytime particle-strong acidity was associated with a deficit in evening PEFR (-0.5 liters/minute, 95% Cl - 1.2 to 0.2) and increased incidence of cold episodes that evening or the subsequent morning (OR=1.35,95% CI 1.14-1.61). A 20-mug/m3 increment in 24-hour respirable particles lagged by 24 hours was associated with a deficit in evening PEFR (-0.5 liters/minute, 95% Cl - 1.4 to 0.4) and increased incidence of cough episodes that evening or the subsequent morning (OR=1.37,95% Cl 1.13-1.66). These results confirm ...
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