Memory for Flu Facts and Myths and Effects on Vaccine Intentions
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Factorial Assignment
Primary Purpose: Educational/Counseling/Training
|Official Title:||"Myths and Facts" About the Flu: Health Education Campaigns Can Reduce Vaccination Intentions|
- Memory for truth of information in a flyer.
- Intention to get flu vaccine in upcoming season.
|Study Start Date:||March 2005|
|Estimated Study Completion Date:||June 2005|
Public information campaigns often warn people about false and unreliable medical claims by juxtaposing “myths” and “facts.” The effectiveness of such communications has rarely been assessed. We assessed whether people systematically misremember the “myths” (false information) as true, and to assess effects on perceptions of risk and behavioral intentions.
In an experimental study, participants read either a published CDC flyer on “Facts and Myths” about the flu vaccine, or a “Facts Only” version; a separate control group read no flyer. Participants completed the outcome measures either immediately or after 30 minutes.
Primary measures were memory for information about the flu presented in the flyer, ratings of perceived risks associated with the flu, and personal intentions to get vaccinated in the upcoming season.
After a delay of 30 minutes, participants who read the “Facts and Myths” flyer systematically misremembered myths as facts. Both versions of the flyer had the immediate effect of increasing intentions to get a flu vaccine, compared to the control group. After 30 minutes, however, participants who read the “Facts and Myths” flyer reported lower intentions to get vaccinated, compared to those who read the same flyer with no delay, and compared to all participants who read the “Facts Only” flyer.
In sum, people show a bias to think that incompletely remembered information is true, turning “myths” into “facts.” Hence public information campaigns should emphasize information that is true. Repeating false information, even as a warning, can create the unintended consequence of belief in the information.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00296270
|United States, Michigan|
|University of Michigan|
|Ann Arbor, Michigan, United States, 48109|
|Rotman School of Management, University of Toronto|
|Toronto, Ontario, Canada, M5S 3E6|
|Principal Investigator:||Ian Skurnik, PhD||Rotman School of Management, University of Toronto|