The risk of dying on days of higher air pollution among the socially disadvantaged elderly |
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Authors: | Cakmak Sabit Dales Robert E Rubio Maria Angelica Vidal Claudia Blanco |
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Affiliation: | aHealth Canada, Department of Statistics, Ottawa Health Research Institute, 50 Columbine Driveway, Ottawa, Ont., Canada K1A 0K9;bHealth Canada, Departments of Medicine and Epidemiology, The Ottawa Hospital (General Campus), University of Ottawa, 501 Smyth Road, Box 211, Ottawa, Ont., Canada K1H 8L6;cDepartamento de Quimcia, Universidad de Santiago de Chile, Avenida Libertador Bernardo O'Higgins, No. 3363, SANTIAGO;dComisión Nacional del Medio Ambiente (CONAMA), Moneda 970, Piso 12, Metropolitana De Santiago, Chile |
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Abstract: | RationaleThe estimated mortality rate associated with ambient air pollution based on general population studies may not be applicable to certain subgroups.ObjectiveThe objective of the present study was to determine the influence of age, education, employment status and income on the risk of mortality associated with ambient air pollution.MethodsDaily time-series analyses tested the association between daily air pollution and daily mortality in seven Chilean urban centers during the period January 1997–December 2007. Results were adjusted for long-term trends, day-of-the week and humidex.ResultsInterquartile increases in particulate matter (PM10 and PM2.5), sulphur dioxide, nitrogen dioxide, carbon monoxide, and elemental and organic carbon were associated with a 4–7% increase in mortality among those who did not complete primary school (p<0.05) vs. 0.5–1.5% among university graduates (p>0.05). Among those at least 85 years of age respective estimates were 2–7%. However, among the elderly who did not complete primary school, respective estimates were 11–19% (p<0.05). The degree of effect modification was less for income and employment status than education, and sex did not modify the results.ConclusionThe socially disadvantaged, especially if elderly appear to be especially susceptible to dying on days of higher air pollution. Concentrations deemed acceptable for the general population would not appear to protect this susceptible subgroup. |
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Keywords: | Air pollution Elderly Environment Epidemiology Mortality |
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