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American Journal of Epidemiology Vol. 153, No. 10 : 1027-1028
Copyright © 2001 by The Johns Hopkins University School of Hygiene and Public Health

LETTERS TO THE EDITOR

RE: "ESTIMATING PARTICULATE MATTER-MORTALITY DOSE-RESPONSE CURVES AND THRESHOLD LEVELS: AN ANALYSIS OF DAILY TIME-SERIES FOR THE 20 LARGEST US CITIES"

Aurelio Tobias and Marc Saez

Department of Clinical Epidemiology and Public Health Hospital de la Santa Creu i Sant Pau E-08041 Barcelona, Spain
Research Group on Statistics Applied Economics and Health (GRECS) Department of Economics University of Girona E-17001 Girona, Spain


   INTRODUCTION
 
We have read with great interest the paper by Daniels et al. (1Go). They have gone further than other studies on the short-term effects of air pollution on health. The authors used an improved modeling strategy to evaluate dose-response relations and threshold levels. However, because of combined data from different US cities, heterogeneity in the dose-response curves across cities was found for total and cardiovascular mortality and for respiratory mortality in the mean lag case.

When information from different sources is combined, . . . [Full Text of this Article]


   REFERENCES
 
Michael J. Daniels, Francesca Dominici, Scott L. Zeger and Jonathan M. Samet

Department of Statistics Iowa State University Ames, IA 50011
Department of Biostatistics School of Hygiene and Public Health Johns Hopkins University Baltimore, MD 21205-2179
Department of Epidemiology School of Hygiene and Public Health Johns Hopkins University Baltimore, MD 21205-2179


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A. Tobias, M. Saez, M. J. Daniels, F. Dominici, S. L. Zeger, and J. M. Samet
RE: "ESTIMATING PARTICULATE MATTER-MORTALITY DOSE-RESPONSE CURVES AND THRESHOLD LEVELS: AN ANALYSIS OF DAILY TIME-SERIES FOR THE 20 LARGEST US CITIES"
Am. J. Epidemiol., May 15, 2001; 153(10): 1027 - 1028.
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