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 ...
Mots-clés Pascal : Pollution air, Climat, Fungi, Thallophyta, Allergène, Origine végétale, Eté, Appareil respiratoire pathologie, Fonction respiratoire, Débit expiratoire, Enfant, Homme, Toxicité, Epidémiologie, Pennsylvanie, Etats Unis, Amérique du Nord, Amérique
Mots-clés Pascal anglais : Air pollution, Climate, Fungi, Thallophyta, Allergen, Plant origin, Summer, Respiratory disease, Lung function, Expiratory flow rate, Child, Human, Toxicity, Epidemiology, Pennsylvania, United States, North America, America
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0217614
Code Inist : 002B11D. Création : 199608.