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A job-exposure matrix is a tool used to assess exposure to potential health hazards in occupational epidemiological studies.
Essentially, a JEM comprises a list of levels of exposure to a variety of harmful agents for selected occupational titles. In large population-based epidemiological studies, JEMs may be used as a quick and systematic means of converting coded occupational data into a matrix of possible exposures, eliminating the need to assess each individual's exposure in detail.
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