Related Experiment Video
Updated: Jul 19, 2026

Minimal Erythema Dose (MED) Testing
Published on: May 28, 2013
Mediation of a middle school skin cancer prevention program
Kim D Reynolds1, David B Buller, Amy L Yaroch
1Institute for Health Promotion and Disease Prevention, University of Southern California, Alhambra, CA 91803, USA. kdreynol@usc.edu
Abstract:
This study tested potential mediators of a school-based skin cancer prevention intervention for middle school children (6th-8th grades; N = 1,788). Ten variables were tested on 4 criteria to establish mediation, including (a) intervention related to outcome, (b) intervention related to mediators, (c) mediators related to outcome, and (d) mediated effect statistically significant. Sun-safe behaviors (e.g., sunscreen use) and potential mediators were measured with a self-report questionnaire. All criteria were met for Barriers--Sunscreen, Perceived Self-Efficacy, and Knowledge when the mediators were tested separately. In multiple mediator analyses, barriers to sunscreen use and self-efficacy satisfied Criteria 1-3 but were not statistically significant (Criterion 4). Barriers to sunscreen use, perceived self-efficacy for sun-safe behavior, and knowledge may serve as mediators.
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