title: Limitations in the use of job exposure matrices.
abstract: A Job Exposure Matrix (JEM) is a cross classification of occupations, industries and exposures within a given job. A general JEM covers all occupations and industries. Severe misclassification by using such a JEM is hardly avoidable. Use of a general JEM will therefore rarely be able to identify risk ratios in the moderately elevated range. However, a general JEM could be an important tool in looking for differentiated misclassification, a frequently mentioned problem in case-control studies. Principles of this kind of use is given in the text.
authors.affiliation: Institute of Social Medicine, Aarhus, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Olsen
mesh_terms: D003627:Data Interpretation, Statistical; D004781:Environmental Exposure; D004812:Epidemiologic Methods; D015386:Hazardous Substances / Q000009:adverse effects; D006801:Humans; D007587:Job Description; D009784:Occupational Diseases; D009787:Occupational Medicine; D009790:Occupations / Q000145:classification*
chemical_list: D015386:Hazardous Substances