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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

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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.