Promoting Protection of Others to Increase Future COVID-19 Booster Shot Vaccination Intentions in Younger Adult Canadians: Evaluating the Efficacy of Short Video-based Interventions
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Sponsor
- Enrollment
- 3,567
- Locations
- 2
- Primary Endpoint
- Vaccine Intentions
Study Overview
Brief Summary
While COVID-19 vaccine uptake has generally been high in Canada, with 83.4% of the total population having received the first two doses (i.e., primary series), additional "booster" uptake has been slower, especially among young adults aged 18-39. Throughout the pandemic, young adults have experienced less personal risk from COVID-19 infection and this has led to lower motivation to vaccinate when it is recommended. Achieving high rates of up-to-date vaccine coverage is important in this group to anticipate new variants and waves of infection and changes to recommendations which might include annual or seasonal vaccination. Three video interventions, intended to motivate Canadian young adults to adopt positive intentions toward continued COVID-19 vaccination, will be developed and tested: an informational comparison video, an altruistic video, and an individualistic video. Participants will be 3300 Canadian younger adults who will be randomly assigned to watch these videos. The first arm will only receive the informational video, the second arm the informational and altruistic videos, and the third arm the informational, altruistic, and individualistic videos. All participants will complete a brief online survey before and after viewing the assigned video(s). The goal of the study is to examine the efficacy of altruistic and individualistic messages, beyond informational messages, in increasing intentions for COVID-19 vaccination in this age group.
Detailed Description
The COVID-19 vaccine has significantly reduced mortality from the COVID-19 disease, and relieved the pressure on society, the economy, and the healthcare system caused by the pandemic. However, waning immunity and the emergence of new, vaccine-evasive variants like Omicron have necessitated additional vaccine doses, or "booster shots". Similar to trends for COVID-19 vaccination and other routine vaccinations, young adults (aged 18-39) have demonstrated lower uptake of booster vaccination, and evidence suggests that public health recommendations are no longer translating to vaccine uptake. This study will examine the efficacy of altruistic and individualistic messages over informational messages in increasing vaccine intentions in this age group.
This study has four primary objectives:
- Estimate pre- to post-intervention changes in COVID-19 vaccine intentions of a altruistic video intervention.
- Estimate pre- to post-intervention changes in COVID-19 vaccine intentions of a combined altruistic + individualistic video
- Estimate between-group (altruistic vs. vaccine-informational) differences in COVID-19 vaccine intentions post-intervention
- Estimate the between-group (altruistic + individualism vs. vaccine-informational) differences in COVID-19 vaccine intentions post-intervention
In addition, there is an exploratory, multivariable objective:
- To estimate the multivariable associations of vaccine intentions in each intervention group.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Prevention
- Masking
- Single (Investigator)
Masking Description
The survey company, Dynata, will collect all data and manage group assignments. Participants' intervention group assignments will be unavailable to the investigator.
Eligibility Criteria
- Ages
- 18 Years to 39 Years (Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •Residing within Canada
- •Aged between 18 and 39.
Exclusion Criteria
- Not provided
Arms & Interventions
Informational Video
Participants will watch a 1-minute video detailing the impact vaccination has had on the COVID-19 pandemic, where accurate information on vaccination can be found, and the convenience of vaccination.
Intervention: Informational Video (Behavioral)
Informational + Altruistic Video
Participants will first watch the 1-minute informational video before watching an additional 40-second video eliciting altruistic motivations for vaccination. The purpose of this arm is to test whether altruistic messages are efficacious to increase vaccine intentions beyond providing only vaccine information.
Intervention: Informational Video (Behavioral)
Informational + Altruistic Video
Participants will first watch the 1-minute informational video before watching an additional 40-second video eliciting altruistic motivations for vaccination. The purpose of this arm is to test whether altruistic messages are efficacious to increase vaccine intentions beyond providing only vaccine information.
Intervention: Altruistic Video (Behavioral)
Informational + Altruistic + Individualistic Video
Participants will watch the 1-minute informational video, the 40-second altruistic video, and an additional 40-second video eliciting individualistic motivations for vaccination. This arm will be used to test if combined altruistic and individualistic messages provide a greater effect than providing only vaccine information.
Intervention: Informational Video (Behavioral)
Informational + Altruistic + Individualistic Video
Participants will watch the 1-minute informational video, the 40-second altruistic video, and an additional 40-second video eliciting individualistic motivations for vaccination. This arm will be used to test if combined altruistic and individualistic messages provide a greater effect than providing only vaccine information.
Intervention: Altruistic Video (Behavioral)
Informational + Altruistic + Individualistic Video
Participants will watch the 1-minute informational video, the 40-second altruistic video, and an additional 40-second video eliciting individualistic motivations for vaccination. This arm will be used to test if combined altruistic and individualistic messages provide a greater effect than providing only vaccine information.
Intervention: Individualistic Video (Behavioral)
Outcomes
Primary Outcomes
Vaccine Intentions
Time Frame: Pre- and post-intervention, within the same survey. The length of the survey is projected to be about 12 minutes.
Intentions to receive COVID-19 vaccines as they are continually recommended will be measured using the Precaution Adoption Process Model (PAPM). The PAPM is a stage-based model of health decision-making, and will be adapted to contain the categories: unengaged, undecided, decided to, and decided not to receive recommended COVID-19 vaccines. Participants will provide their stage before and after the intervention has been administered, all within the same survey.
Secondary Outcomes
No secondary outcomes reported
Investigators
Zeev Rosberger
Senior Investigator
Sir Mortimer B. Davis - Jewish General Hospital