An Evaluation of a Dynamic Web-Based Visualization of Community Immunity

NCT04787913 | Completed

• 1 other identifier: herdimm
• Study Type: interventional
• Target: 5,516
• Locations: 1 country
• Sites: 1

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).

Conditions

Vaccine-Preventable Diseases

Keywords

herd immunity; community immunity; web-based application; visualization

Outcome Measures

Primary Outcomes (1)

• Risk perception

  6 items assessing risk perception (item 1 = risk perception as comprehension, scale 0-100, higher numbers better; items 2-5 = risk perception as feelings, scale 1-7, higher numbers better; complete list of items and response wording available in uploaded questionnaire herdimm\_phase3\_questionnaire\_2021-03-01.pdf)

  immediately after intervention or control

Secondary Outcomes (5)

• Emotions

  immediately after intervention or control

• Knowledge

  immediately after intervention or control

• Trust in information

  immediately after intervention or control

• Vaccination intentions

  immediately after intervention or control

• 5C scale

  immediately after intervention or control

Study Arms (13)

controlgeneric

NO INTERVENTION

No intervention provided. Participant answers outcome questions about an unnamed vaccine-preventable disease. English and French.

controlmeasles

NO INTERVENTION

No intervention provided. Participant answers outcome questions about measles. English and French.

controlpertussis

NO INTERVENTION

No intervention provided. Participant answers outcome questions about pertussis. English and French.

controlflu

NO INTERVENTION

No intervention provided. Participant answers outcome questions about flu. English and French.

herdimmgeneric

EXPERIMENTAL

Web-based application (main intervention) provided. Participant answers outcome questions about an unnamed vaccine-preventable disease. English and French.

Behavioral: herdimm

herdimmmeasles

EXPERIMENTAL

Web-based application (main intervention) provided. Participant answers outcome questions about measles. English and French.

Behavioral: herdimm

herdimmpertussis

EXPERIMENTAL

Web-based application (main intervention) provided. Participant answers outcome questions about pertussis. English and French.

Behavioral: herdimm

herdimmflu

EXPERIMENTAL

Web-based application (main intervention) provided. Participant answers outcome questions about flu. English and French.

Behavioral: herdimm

robertkochgeneric

ACTIVE COMPARATOR

Web-based application (comparator) provided. Participant answers outcome questions about an unnamed vaccine-preventable disease. English only.

Behavioral: robertkochgeneric

sbsnewsgeneric

ACTIVE COMPARATOR

Video (comparator) provided. Participant answers outcome questions about an unnamed vaccine-preventable disease. English only.

Behavioral: sbsnewsgeneric

guardianmeasles

ACTIVE COMPARATOR

Video (comparator) provided. Participant answers outcome questions about measles. English only.

Behavioral: guardianmeasles

theotheredmundmeasles

ACTIVE COMPARATOR

Video (comparator) provided. Participant answers outcome questions about measles. English only.

Behavioral: theotheredmundmeasles

publichealthagencycanadaflu

ACTIVE COMPARATOR

Video (comparator) provided. Participant answers outcome questions about flu. English and French.

Behavioral: publichealthagencycanadaflu

Interventions

herdimm BEHAVIORAL

In this visualization participants can build their own avatar representing themselves and 8 other avatars representing people around them, like their family or coworkers. Our visualization then uses these avatars in a brief narrated video explaining how herd immunity works.

herdimmflu; herdimmgeneric; herdimmmeasles; herdimmpertussis

guardianmeasles BEHAVIORAL

A screen capture of an interactive visualization: https://www.theguardian.com/society/ng-interactive/2015/feb/05/-sp-watch-how-measles-outbreak-spreads-when-kids-get-vaccinated

guardianmeasles

theotheredmundmeasles BEHAVIORAL

A gif showing measles spreading through populations with differing levels of vaccine coverage: https://imgur.com/gallery/8M7q8#J7LANQ4

theotheredmundmeasles

sbsnewsgeneric BEHAVIORAL

A video showing how herd immunity works in general: https://www.sbs.com.au/news/two-sydney-babies-too-young-to-be-vaccinated-infected-with-measles

sbsnewsgeneric

publichealthagencycanadaflu BEHAVIORAL

A video showing how herd immunity works in the context of influenza: https://www.canada.ca/fr/sante-publique/services/video/la-grippe-n-en-passez-pas-les-maux.html

publichealthagencycanadaflu

robertkochgeneric BEHAVIORAL

A web-based application showing how herd immunity works in general: http://rocs.hu-berlin.de/D3/herd/

robertkochgeneric

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• 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

You may not qualify if:

• \- No internet access

Sponsors & Collaborators

• Laval University: lead

Study Sites (1)

Université Laval

Québec, G1V 0A6, Canada

Location

MeSH Terms

Conditions

Vaccine-Preventable Diseases

Condition Hierarchy (Ancestors)

Infections

Study Officials

• Holly Witteman, PhD

  Laval University

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: INVESTIGATOR
• Masking Details: This will be a single-blinded study because we cannot mask participants to the fact that they have been randomized to a visualization e.g., about measles. However, participants will not necessarily know the purpose of the study arm to which they are assigned,and investigators will be blinded to study arm during data analysis (investigators are not aware of whether the next eligible participant will be receiving treatment or control intervention.)
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: FACTORIAL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Model Details: 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.

Study Record Dates

• First Submitted: March 4, 2021
• First Posted: March 9, 2021
• Study Start: March 1, 2021
• Primary Completion: July 1, 2021
• Study Completion: July 1, 2021
• Last Updated: August 29, 2024

Record last verified: 2024-08

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, SAP, ICF, ANALYTIC CODE
• Time Frame: As soon as possible upon completion of the study and posting of a preprint with results.
• Access Criteria: Freely available.

Locations

CA (1)