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Activity Number:
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33
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Type:
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Contributed
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Date/Time:
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Sunday, July 29, 2007 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Statistics in Epidemiology
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| Abstract - #309988 |
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Title:
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The Effect of PM2.5 on Hospital Admissions Rates by Season and Region
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Author(s):
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Keita Ebisu*+ and Michelle Bell and Roger Peng and Francesca Dominici
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Companies:
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Yale University and Yale University and Johns Hopkins University and Johns Hopkins University
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Address:
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, New Haven, CT, 06510,
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Keywords:
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Air Pollution ; Hospital Admissions ; Particulate Matter
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Abstract:
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We investigated the seasonal and regional associations between PM2.5 levels and cause-specific hospital admission rates using two models: a pollutant-seasonal indicator model; and a model to smooth seasonal patterns of county-specific log relative rates with a sine/cosine function. Both models were fitted using a generalized additive model adjusting for potential confounders. In order to pool the county-specific estimates to form national average estimates, we fit a Bayesian hierarchical model using Two-Level Normal independent sampling estimation with non-informative priors. The results of both models showed that the association between PM2.5 and admissions were larger in the winter for cardiovascular and respiratory causes. There was also a regional difference between eastern and western US.
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