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A method for effect modifier assessment (EMA) in ergonomic intervention research

Journal article
Authors Kasper Edwards
Jörgen Winkel
Published in Applied Ergonomics
Volume 72
Pages 113-120
ISSN 0003-6870
Publication year 2018
Published at Department of Sociology and Work Science
Pages 113-120
Language en
Links https://doi.org/10.1016/j.apergo.20...
Keywords Ergonomic intervention, production ergonomics, effect modification, confounding, epidemiology, research method
Subject categories Production Engineering, Human Work Science and Ergonomics, Epidemiology, Work Sciences

Abstract

The numerous opportunities for effect modifications pose a major challenge in ergonomic intervention research. Even studies in systematic reviews that are assessed as being of high quality generally lack any proper consideration of the potential effect modifiers. We have developed a method for effect modifier assessment (EMA) in intervention research. The EMA method uses a participatory workshop consisting of representatives from all occupational groups in the investigated organization. The workshop identifies both intervention and modifier events including “confounders” and “effect modifiers” according to epidemiologic terminology. These are categorized into themes, then analyzed and evaluated for their potential effects on the investigated outcomes. The overall impact of the pooled modifier themes is finally estimated in relation to the estimated impact of the intervention events. In the present study, the EMA method was tested in two cases. The findings suggest that it provides information that strengthens inferences about the impact of the investigated ergonomic interventions. Further evaluation of the method is recommended.

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