International Journal of Epidemiology, Vol 22, S65-S71, Copyright © 1993 by International Epidemiological Association
J Bouyer and D Hemon
During the last decade, the use of job exposure matrices (JEM) in
occupational studies has grown but uncertainty remains among
epidemiologists and industrial hygienists regarding this methodology and
appropriate methodological tools are needed to study the performance of
JEM. It must first be emphasized that a true validation can rarely be
achieved and that the performance of a JEM must be tested against the
exposure evaluation of another method taken as a reference, such as expert
assessment. This comparison comprises three main elements: the ability of
the JEM to evaluate accurately the exposure itself, its statistical
performances in terms of bias and power and its ability to detect known
associations between risk factors and disease. When comparing JEM and
experts, all aspects of the two methods have to be looked at and a balance
struck between the advantages and shortcomings of each of them. The problem
should not be reduced to a trade-off between the precision provided by
experts and the cost savings possible by using JEM. Finally, it is
important to avoid a systematic opposition between JEM and expert
assessments, as one positive result of their comparison may be the
improvement of both methods of exposure evaluation.
ARTICLES
Studying the performance of a job exposure matrix
Department of Epidemiological and Statistical Research on Environment and Health, INSERM U.170, Villejuif, France.
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