title: Increased presentations to emergency departments for asthma associated with rye grass pollen season in inland NSW.
abstract: OBJECTIVE
  This study measured the frequency and geographical extent of peaks in asthma presentations to emergency departments in inland NSW; it assessed the characteristics of patients who presented at peak presentation times during the rye grass pollination season (October-November) and at other times of the year.
  
  
  METHODS
  Data describing over 13 years of daily emergency department presentations with a provisional diagnosis of asthma at nine inland NSW base hospitals were assembled. Days of counts in the top 0.1 percentile for each emergency department were classified as peak asthma count days.
  
  
  RESULTS
  While the rye grass pollen season accounts for only 17% of days in the year, 53% of peak asthma count days fell within that period. Patients aged over 14 years represented 74% of visits on peak asthma count days during the pollen season and 50% on peak days at other times of the year.
  
  
  CONCLUSIONS
  Under the right climatic conditions, rye grass pollen may be responsible for presentations for acute asthma to emergency departments in inland NSW.
authors: NSW Public Health Officer Training Program, NSW Department of Health.
authors: Timothy J
authors: TJ
authors: Hayden
authors: David J
authors: DJ
authors: Muscatello
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000553:Ambulatory Care / Q000706:statistics & numerical data; D001249:Asthma / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008129:Lolium / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D009517:New South Wales / Q000453:epidemiology; D011058:Pollen / Q000009:adverse effects*; D012621:Seasons; D055815:Young Adult