© 2004 by Oxford University Press
© 2004 Oxford University Press
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Re: Mortality From Lymphohematopoietic Malignancies Among Workers in Formaldehyde Industries
Correspondence to: Charles W. Axten, PhD, CIH, Health Risk Solutions, LLC, 1606 Maddux Lane, McLean, VA 22101-3200 (e-mail: chuckaxten@cox.net)
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The study described in the article by Hauptmann et al. (1) has several strengths, including large size, long follow-up, and attempts to control for potentially important confounding factors. However, the study does not provide conclusive evidence of a causal association between formaldehyde exposure and leukemia for several reasons. In particular, the large relative risks (RRs) reported for the internal comparison stratified by exposure category
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J Natl Cancer Inst 2004 96: 967-968.