title: A case-control analysis of exposure to traffic and acute myocardial infarction.
abstract: BACKGROUND
  Long-term exposure to particulate air pollution has been associated with an increased risk of dying from cardiopulmonary and ischemic heart disease, yet few studies have evaluated cardiovascular end points other than mortality. We investigated the relationship between long-term exposure to traffic and occurrence of acute myocardial infarction (AMI) in a case-control study.
  
  
  METHODS
  A total of 5,049 confirmed cases of AMI were identified between 1995 and 2003 as part of the Worcester Heart Attack Study, a community-wide study examining changes over time in the incidence of AMI among greater Worcester, Massachusetts, residents. Population controls were selected from Massachusetts resident lists. We used cumulative traffic within 100 m of subjects' residence and distance from major roadway as proxies for exposure to traffic-related air pollution. We estimated the relationship between exposure to traffic and occurrence of AMI using logistic regression, and we adjusted for the following potential confounders: age, sex, section of the study area, point sources emissions of particulate matter with aerodynamic diameter < 2.5 microm, area socioeconomic characteristics, and percentage of open space.
  
  
  RESULTS
  An increase in cumulative traffic near the home was associated with a 4% increase in the odds of AMI per interquartile range [95% confidence interval (CI), 2-7%], whereas living near a major roadway was associated with a 5% increase in the odds of AMI per kilometer (95% CI, 3-6%).
  
  
  CONCLUSIONS
  These results provide support for an association between long-term exposure to traffic and the risk of AMI.
authors: Department of Environmental Health,Harvard School of Public Health, Boston, Massachusetts, USA. ctonne@hsph.harvard.edu
authors: Cathryn
authors: C
authors: Tonne
authors: Steve
authors: S
authors: Melly
authors: Murray
authors: M
authors: Mittleman
authors: Brent
authors: B
authors: Coull
authors: Robert
authors: R
authors: Goldberg
authors: Joel
authors: J
authors: Schwartz
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D008404:Massachusetts / Q000453:epidemiology; D009203:Myocardial Infarction / Q000453:epidemiology*; D014505:Urban Population; D001335:Vehicle Emissions
chemical_list: D001335:Vehicle Emissions