title: Associations between atmospheric concentrations of spores and emergency department visits for asthma among children living in Montreal.
abstract: The authors carried out a time-series study to determine whether short-term increases in the concentrations of spores were associated with emergency department visits from asthma among children 0 to 9 years of age in Montreal, 1994-2004. Concentrations of spores were obtained from one sampling monitor. The authors used parametric Poisson models to model the association between daily admissions to emergency rooms for asthma and ambient exposures to a variety of spores, adjusting for secular trends, changes in weather, and chemical pollutants. For first admissions and exposures to Basidiomycetes, the authors found positive associations at all lags but the concurrent day. For Deuteromycetes and Cladosporium, risks were positive starting at lag 3 days and diminished at lag 6 days. There was little evidence of associations for readmissions, except for Basidiomycetes. The results indicate that Basidiomycetes and Cladosporium spores may be implicated in the exacerbation of asthma among children, most notably in the case of first-time visits to emergency departments, and that the effects appear to be delayed by several days.
authors.affiliation: Department of Geography, Universite du Quebec a Montreal, Montreal, Quebec, Canada.
authors.forename: Marie
authors.initials: M
authors.lastname: Raphoz
authors.forename: Mark S
authors.initials: MS
authors.lastname: Goldberg
authors.forename: Michelle
authors.initials: M
authors.lastname: Garneau
authors.forename: Léa
authors.initials: L
authors.lastname: Héguy
authors.forename: Marie-France
authors.initials: MF
authors.lastname: Valois
authors.forename: Frédéric
authors.initials: F
authors.lastname: Guay
mesh_terms: D000391:Air Microbiology; D000397:Air Pollution / Q000009:adverse effects; D001249:Asthma / Q000453:epidemiology* / Q000209:etiology; D001487:Basidiomycota; D002648:Child; D002675:Child, Preschool; D002963:Cladosporium; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D004784:Environmental Monitoring / Q000706:statistics & numerical data; D062665:Epidemiological Monitoring; D032902:Ganoderma; D006801:Humans; D007223:Infant; D019570:Inhalation Exposure / Q000009:adverse effects* / Q000706:statistics & numerical data; D003904:Mitosporic Fungi; D016012:Poisson Distribution; D011792:Quebec / Q000453:epidemiology; D012307:Risk Factors; D013172:Spores, Fungal