Clinical trial NCT04787913: An Evaluation of a Dynamic Web-Based Visualization of Community Immunity
Official title: An Evaluation of a Dynamic Web-Based Visualization of Community Immunity
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Vaccine-Preventable Diseases
Keywords: herd immunity
community immunity
web-based application
visualization
Lead sponsor: Laval University
Sponsor class: OTHER
First posted: 2021-03-09
Enrollment: 5516
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: FACTORIAL
Intervention model description: This study will be a multi-armed factorial randomized controlled trial. Each participant will be randomly allocated to focus on one of four possible vaccine-preventable diseases: measles, pertussis, flu (influenza), or a generic vaccine-preventable disease (hereby referred to as "generic"). All aspects of the study (visualization, questionnaire) will be focused on that one disease for that participant. The primary and secondary outcomes of the study which are risk perception, emotion, knowledge, trust in information provided, attitudes and a validated scale about vaccination (Betsch et al. 2018) will be assessed in an online questionnaire.

Because three online visualizations are available only in English whereas our study will be conducted in both English and French, we will use slightly different randomization patterns for English- and French-speaking participants.
Primary purpose: HEALTH_SERVICES_RESEARCH

Brief summary: This study is a PhD project conducted by Ms. Hina Hakim, supervised by Dr. Holly O. Witteman, PhD, and co-supervised Dr. Daniel Reinharz, professors and researchers at the Faculty of Medicine at Laval University. The purpose of this study is to evaluate the effects of visualization conveying the concept of community immunity or herd immunity on risk perception (towards individual, family, community and vulnerable people in communities) (primary outcome) and on emotions, attitudes, knowledge, and behavioural intentions (secondary outcomes).

Detailed description: Visualization is a powerful communication mechanism that uses pre-attentive processing to communicate large amounts of information rapidly in understandable and compelling ways (Healey and Enns 2012). A systematic review demonstrates that there are some interventions available for conveying the concept of community immunity, and very few evaluate interventions for their effects on vaccine intentions and uptake as well as their precursors, such as knowledge, attitudes, knowledge and none on emotions (Hakim et al. 2018).

The purpose of this study is to evaluate the effects of visualization conveying the concept of community immunity on risk perception (to individual, family, community and vulnerable people in communities) (primary outcome) and on emotions, attitudes, knowledge, and behavioural intentions (secondary outcomes).

Eligibility criteria: Inclusion Criteria:

* Members of the general population in Canada
* At least 18 years old
* Able to provide free and informed consent
* Able to read and understand French or English
* Able to use a computer

Exclusion Criteria:

- No internet access

Primary outcomes:
measure: Risk perception
timeFrame: immediately after intervention or control
Secondary outcomes:
measure: Emotions
timeFrame: immediately after intervention or control
measure: Knowledge
timeFrame: immediately after intervention or control
measure: Trust in information
timeFrame: immediately after intervention or control
measure: Vaccination intentions
timeFrame: immediately after intervention or control
measure: 5C scale
timeFrame: immediately after intervention or control
Other outcomes:
Locations:
city: Québec
country: Canada
facility: Université Laval
Study officials:
affiliation: Laval University
name: Holly Witteman, PhD
role: PRINCIPAL_INVESTIGATOR
References: