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American Journal of Epidemiology Vol. 152, No. 2 : 194-195
Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health

LETTERS TO THE EDITOR

RE: "PARALLEL ANALYSES OF INDIVIDUAL AND ECOLOGIC DATA ON RESIDENTIAL RADON, COFACTORS, AND LUNG CANCER IN SWEDEN"

Bernard L. Cohen

University of Pittsburgh Pittsburgh, PA 15260


   INTRODUCTION
 
The recent paper by Lagarde and Pershagen (1Go) reports that the slope of the individual data on risk versus dose is positive, whereas the slope of these data aggregated by counties to give an ecologic analysis is negative. They (and others) claim that this finding invalidates the conclusions of my findings (2Go) from an ecologic study of lung cancer rates versus average radon levels for US counties. My study, designed only as a test of the linear-no threshold theory (LNT), reported a strong negative correlation, leading to the conclusion that LNT fails very badly in the low-dose . . . [Full Text of this Article]


   REFERENCES
 
Frédéric Lagarde and Göran Pershagen

Division of Environmental Epidemiology Institute of Environmental Medicine Karolinska Institutet S-171 77 Stockholm, Sweden


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 Int J EpidemiolHome page
S. Greenland
Ecologic versus individual-level sources of bias in ecologic estimates of contextual health effects
Int. J. Epidemiol., December 1, 2001; 30(6): 1343 - 1350.
[Abstract] [Full Text] [PDF]

Home page
 Am J EpidemiolHome page
B. L. Cohen, F. Lagarde, and G. Pershagen
RE: "PARALLEL ANALYSES OF INDIVIDUAL AND ECOLOGIC DATA ON RESIDENTIAL RADON, COFACTORS, AND LUNG CANCER IN SWEDEN"
Am. J. Epidemiol., July 15, 2000; 152(2): 194 - 195.
[Full Text] [PDF]