© 2004 by Oxford University Press
© 2004 Oxford University Press
CORRESPONDENCE |
RESPONSE: Re: Extended Follow-up of a Cohort of British Chemical Workers Exposed to Formaldehyde
Affiliation of authors: MRC Environmental Epidemiology Unit, University of Southampton, Southampton, U.K.
Correspondence to: Professor David Coggon, MRC Environmental Epidemiology Unit, Southampton General Hospital, Southampton SO16 6YD, U.K. (e-mail: dnc@mrc.soton.ac.uk)
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As Dr. Greenberg points out, the optimal choice of reference rates in occupational cohort studies is not always straightforward. The advantage of comparison with data for the general population is that these data are often readily available and statistically stable. Bias may occur, however, if a substantial proportion of the reference
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J Natl Cancer Inst 2004 96: 1037.