Association between Air Pollution and Multiple Respiratory Hospitalizations among the Elderly in Vancouver, Canada
Source: Inhalation Toxicology, Volume 18, Number 13, December 1 2006 , pp. 1005-1011(7)
Publisher: Informa Healthcare
Abstract:Recurrent events, such as repeated hospital admissions for the same health outcome, occur frequently in environmental health studies. In this study, we conducted an analysis of data on repeated respiratory hospitalizations among the elderly in Vancouver, Canada, for the period of June 1, 1995, to March 31, 1999, using a new method proposed by (Dewanji and Moolgavkar 2000, 2002) for recurrent events, and compared it with some traditional methods. In particular, we assessed the impact of ambient gaseous (SO 2 , NO 2 , CO, and O 3 ) and particulate pollutants (PM 10 , PM 2.5 , and PM 10–2.5 ) as well as the coefficient of haze (CoH) on recurrent respiratory hospital admissions. Using the new procedure, significant associations were found between admissions and 3-day, 5-day, and 7-day moving averages of the ambient SO 2 concentrations, with the strongest association observed at the 7-day lag (RR = 1.044, 95% CI: 1.018–1.070). We also found PM 10–2.5 for 3-day and 5-day lag to be significant, with the strongest association at 5-day lag (RR = 1.020, 95% CI: 1.001–1.039). No significant associations with admission were found with current day exposure.
Document Type: Research Article
Affiliations: 1: Department of Mathematics and Statistics, University of Windsor, Windsor, Ontario, Canada 2: McLaughlin Center for Population Health Risk Assessment, Institute of Population Health, University of Ottawa, Ottawa, Ontario, Canada 3: Department of Epidemiology and Community Medicine, University of Ottawa, Ottawa, Ontario, Canada
Publication date: December 1 2006