A Report of a Four-Group Randomized Trial on the Effect of Messages Based on the Extended Parallel Process Model on Perceptual Dimensions and Preventive Behaviors against COVID-19

Abstract

Background: Coronavirus disease 2019 (COVID-19) and diseases with respiratory symptoms in gatherings such as schools have the potential to escalate into an epidemic. Given the absence of any approved specific treatment for these diseases, prevention remains the only viable approach. This study aimed to investigate the impact of messages rooted in the extended parallel process model (EPPM) on the perceptual dimensions and preventive behaviors related to COVID-19 among girl students in primary schools in Borkhar City, Iran, in 2021. Methods: This randomized controlled educational trial was conducted on 300 elementary students in Borkhar City using a random sampling method. The data collection tool utilized was a researcher-made questionnaire. Students were divided into two intervention groups (intervention through posters and based on the EPPM for teaching prevention behaviors against infectious respiratory diseases such as COVID-19) and one control group. Findings: In the first group of intervention (threat group), after the intervention, the mean scores of attitude (P = 0.030), behavior (P = 0.001), and intention (P = 0.007) variables showed a significant increase compared to before the intervention. In the second group (efficiency group), after the intervention, the mean scores of variables related to denying the authenticity or value of the message (P = 0.001), defensive avoidance (P = 0.027), self-efficacy (P = 0.017), and fear (P = 0.042) also showed a significant increase compared to before the intervention. Conclusion: In general, posters containing information about threats based on the EPPM had a greater impact on perceptual dimensions and preventive behaviors against infectious respiratory diseases like COVID-19. The application of the EPPM was effective in creating perceived intensity and sensitivity towards performing preventive behaviors, as well as in enhancing the attitude, intention, and behaviors of the group studied. © 2024, Isfahan University of Medical Sciences(IUMS). All rights reserved.