American Journal of Epidemiology Vol. 151, No. 1: 50-56
Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health
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Patients with Chronic Obstructive Pulmonary Disease Are at Increased Risk of Death Associated with Urban Particle Air Pollution: A Case-Crossover Analysis
1Unit of Respiratory and Environmental Research, Institut Municipal d'lnvestigació Mèdica Barcelona, Catalonia, Spain
2Environmental Epidemiological Program, Department of Environmental Health, Harvard School of Public Health, and Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School Boston, MA
The authors assessed the acute association between particulate air pollution and mortality among subjects suffering from chronic obstructive pulmonary disease by using a case-crossover analysis. This design avoided the common concerns about the methods used to assess the acute effects of air pollution. The 1, 845 men and the 460 women included were residents of Barcelona, Spain, who were over age 35 years, had died during the period 19901995, and had visited emergency rooms because of a chronic obstructive pulmonary disease exacerbation during the period 19851989. Particle levels (measured as black smoke at the city monitoring stations) were associated with mortality for all causes (odds ratio (OR) for an increase of 20 µ/m3, the interquartile change, adjusted for temperature, humidity, and influenza = 1.112, 95 percent confidence interval (CI): 1.017, 1.215). The association was stronger for respiratory causes (OR = 1.182, 95 percent CI: 1.025, 1.365), but was not significant for cardiovascular causes (OR = 1.077, 95 percent CI: 0.917, 1.264). Older women, patients admitted to intensive care units, and patients with a higher rate of emergency room visits were at greater risk of dying associated with black smoke. The results reinforced the deleterious role of urban pollution and provided information on factors possibly conferring susceptibility to the acute role of air pollution.Am J Epidemiol 2000; 151:50-6.
air pollution; lung diseases; obstructive; mortality
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