reference : Relation between income, air pollution and mortality: A cohort study

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/reference/93051877-e297-4127-a966-cafd12a91584
Bibliographic fields
reftype Journal Article
Abstract BACKGROUND: Community levels of air pollution have been associated with variability in mortality rates, but previous studies have inferred exposure to pollutants on a citywide basis. We investigated mortality in relation to neighbourhood levels of income and air pollution in an urban area. METHODS: We identified 5228 people in the Hamilton-Burlington area of southern Ontario who had been referred for pulmonary function testing between 1985 and 1999. Nonaccidental deaths that occurred in this group between 1992 and 1999 were ascertained from the Ontario Mortality Registry. Mean household income was estimated by linking the subjects' postal codes with the 1996 census. Mean neighbourhood levels of total suspended particulates and sulfur dioxide were estimated by interpolation from data from a network of sampling stations. We used proportional hazards regression models to compute mortality risk in relation to income and pollutant levels, while adjusting for pulmonary function, body mass index and diagnoses of chronic disease. Household incomes and pollutant levels were each divided into 2 risk categories (low and high) at the median. RESULTS: Mean pollutant levels tended to be higher in lower-income neighbourhoods. Both income and pollutant levels were associated with mortality differences. Compared with people in the most favourable category (higher incomes and lower particulate levels), those with all other income-particulate combinations had a higher risk of death from nonaccidental causes (lower incomes and higher particulate levels: relative risk [RR] 2.62, 95% confidence interval [CI] 1.67-4.13; lower incomes and lower particulate levels: RR 1.82, 95% CI 1.30-2.55; higher incomes and higher particulate levels: RR 1.33, 95% CI 1.12-1.57). Similar results were observed for sulfur dioxide. The relative risk was lower at older ages. INTERPRETATION: Mortality rates varied by neighbourhood of residence in this cohort of people whose lung function was tested. Two of the broader determinants of health--income and air pollution levels--were important correlates of mortality in this population.
Author Finkelstein, M. M.; Jerrett, M.; DeLuca, P.; Finkelstein, N.; Verma, D. K.; Chapman, K.; Sears, M. R.
Date Sep 2
ISSN 1488-2329
Issue 5
Journal Canadian Medical Association Journal
Keywords Aged; Air Pollution/*adverse effects; Cohort Studies; Female; Humans; *Income; Male; Middle Aged; *Mortality; Ontario/epidemiology; Proportional Hazards Models; Registries; Respiratory Function Tests; Risk Assessment; Urban Health/*statistics & numerical data
Language eng
Notes Finkelstein, Murray M Jerrett, Michael DeLuca, Patrick Finkelstein, Norm Verma, Dave K Chapman, Kenneth Sears, Malcolm R Journal Article Research Support, Non-U.S. Gov't Canada CMAJ. 2003 Sep 2;169(5):397-402.
PMC 183288
Pages 397-402
Title Relation between income, air pollution and mortality: A cohort study
URL http://www.ncbi.nlm.nih.gov/pmc/articles/PMC183288
Volume 169
Year 2003
Bibliographic identifiers
.reference_type 0
_record_number 18252
_uuid 93051877-e297-4127-a966-cafd12a91584