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Response shift bias: a problem in evaluating nutrition training using self-report measures.

F R Rohs1, C A Langone, R K Coleman

  • 1Department of Agricultural Leadership, Education and Communication, The University of Georgia, Athens, Georgia 30602, USA. eps-dffr@arches.uga.edu

Journal of Nutrition Education
|April 16, 2002
PubMed
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School nutrition training effectiveness was evaluated using two methods. The then/post design revealed significant changes, suggesting traditional pretest/post-test methods may underestimate training benefits due to response shift bias.

Area of Science:

  • Nutrition Science
  • Educational Evaluation
  • Behavioral Science

Background:

  • The Cooperative Extension Service is vital in developing and assessing school nutrition training programs.
  • Evaluating the true impact of these programs is crucial for improving food safety and nutrition education in schools.

Purpose of the Study:

  • To assess the effectiveness of school nutrition training.
  • To investigate the influence of response shift bias on self-reported outcomes.
  • To compare the efficacy of two evaluation designs: pretest/post-test and then/post.

Main Methods:

  • 162 foodservice staff from eight rural schools participated in a food-handling behavior study.
  • Participants were divided into two treatment groups and a control group.

Related Experiment Videos

  • Two evaluation designs were employed: a traditional pretest/post-test and a then/post design.

    • Main Results:

    • The then/post evaluation design yielded significantly more change data compared to the pretest/post-test design.
    • This indicates that a response shift occurred, where participants re-evaluated their baseline understanding after training.
    • The traditional pre/post design may underestimate the educational benefits of the training.

    Conclusions:

    • The then/post evaluation design is more sensitive to detecting changes in self-reported behavior and understanding.
    • Response shift bias can significantly impact the perceived effectiveness of nutrition training programs.
    • Educational benefits of school nutrition training may be underestimated using standard pretest/post-test evaluations.