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Trial registered on ANZCTR


Registration number
ACTRN12624000698572
Ethics application status
Approved
Date submitted
10/05/2024
Date registered
3/06/2024
Date last updated
11/08/2024
Date data sharing statement initially provided
3/06/2024
Type of registration
Prospectively registered

Titles & IDs
Public title
Impact of information presentation and cognitive load on views toward COVID-19 booster vaccines
Scientific title
Impact of information presentation and cognitive load on COVID-19 booster vaccine intentions, attitudes, and knowledge in Australian adults
Secondary ID [1] 312100 0
Nil known
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Long COVID 333769 0
COVID-19 333876 0
Condition category
Condition code
Public Health 330444 330444 0 0
Health promotion/education
Infection 330550 330550 0 0
Other infectious diseases

Intervention/exposure
Study type
Interventional
Description of intervention(s) / exposure
This study will investigate the effects of presenting long COVID and booster-related information on vaccine intentions, knowledge, and attitudes, when the information is presented in terms of either general or specific outcomes. General information will show the likelihood of developing at least one long COVID symptom (with vs. without boosters), while specific information will additionally show likelihoods for 5 specific long COVID symptomatic categories (cardiovascular, gastrointestinal, pulmonary, metabolic, neurological).
Additionally, some participants will be allocated to a cognitive load condition, wherein they will be asked to memorise and later recall a 7-digit number. The purpose of this is to investigate whether an interaction exists between presentation type and cognitive load.

Participants (from the student population) will be able to access the survey link via the Usyd SONApsych website, once they have signed up to participate in the study.

Upon starting the survey, participants will be randomised to 1 of 4 conditions via the Qualtrics Randomiser feature. The four conditions are:

1. General-with-load (general long COVID information and additional cognitive load)
2. General-no-load (general information and no additional cognitive load)
3. Specific-with-load (specific long COVID information and additional cognitive load)
4. Specific-no-load (specific long COVID information and no additional cognitive load)

Each information package is anticipated to take 1-2 minutes to read. Participants who are asked to recall the 7-digit number will be asked to do so right after they have viewed the long COVID information (i.e. they will have to retain the 7-digit number for the duration that they are viewing the long COVID information).

To monitor attention to the survey, we will include an attention check in the outcome questions. The question will ask participants to select a certain response.
Intervention code [1] 328562 0
Behaviour
Comparator / control treatment
General-no-load will be the comparator (general information with no cognitive load task)
Control group
Active

Outcomes
Primary outcome [1] 338204 0
Vaccine intention
Timepoint [1] 338204 0
Immediately following intervention
Primary outcome [2] 338311 0
Vaccine intention
Timepoint [2] 338311 0
Immediately following intervention
Secondary outcome [1] 434959 0
Vaccine attitudes
Timepoint [1] 434959 0
Immediately following intervention
Secondary outcome [2] 434960 0
Vaccine/long COVID knowledge
Timepoint [2] 434960 0
Immediately after intervention
Secondary outcome [3] 435569 0
Vaccine/long COVID knowledge
Timepoint [3] 435569 0
Immediately after intervention
Secondary outcome [4] 435570 0
Vaccine/long COVID knowledge
Timepoint [4] 435570 0
Immediately after intervention

Eligibility
Key inclusion criteria
Live in Australia, aged 18 or above, able to read and write English
Minimum age
18 Years
Maximum age
No limit
Sex
Both males and females
Can healthy volunteers participate?
Yes
Key exclusion criteria
None

Study design
Purpose of the study
Educational / counselling / training
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
The Qualtrics platform includes a “Randomiser” that evenly and randomly allocates participants to each condition. Participants will be randomly allocated to one of the four conditions through this randomiser function.
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Simple randomisation with Qualtrics Randomiser software
Masking / blinding
Who is / are masked / blinded?



Intervention assignment
Other design features
Phase
Not Applicable
Type of endpoint/s
Statistical methods / analysis

Recruitment
Recruitment status
Recruiting
Date of first participant enrolment
Anticipated
29/07/2024
Actual
29/07/2024
Date of last participant enrolment
Anticipated
15/09/2024
Actual
Date of last data collection
Anticipated
15/09/2024
Actual
Sample size
Target
171
Accrual to date
160
Final
Recruitment in Australia
Recruitment state(s)
NSW

Funding & Sponsors
Funding source category [1] 316458 0
University
Name [1] 316458 0
School of Psychology at University of Sydney
Country [1] 316458 0
Australia
Primary sponsor type
University
Name
School of Psychology at University of Sydney
Address
Country
Australia
Secondary sponsor category [1] 318632 0
None
Name [1] 318632 0
Address [1] 318632 0
Country [1] 318632 0

Ethics approval
Ethics application status
Approved
Ethics committee name [1] 315248 0
The University of Sydney Human Research Ethics Committee
Ethics committee address [1] 315248 0
https://www.sydney.edu.au/research/research-integrity-and-ethics.html
Ethics committee country [1] 315248 0
Australia
Date submitted for ethics approval [1] 315248 0
08/04/2024
Approval date [1] 315248 0
24/07/2024
Ethics approval number [1] 315248 0
2024/487

Summary
Brief summary
We wish to investigate whether vaccine intentions, attitudes, and knowledge are differentially influenced when presenting general versus specific long COVID and booster-related information. General information presents risk information in regard to long COVID as a whole, whereas the specific presentation shows information on specific long COVID symptom categories. We therefore aim to investigate whether there is a particular presentation of information that more effectively communicates long COVID and vaccine messages.

We also wish to see if there are any effects of adding a cognitive load task that some participants will have to allocate their attention to. We predict that participants viewing the general long COVID information will show higher vaccine intention, positive attitudes, and knowledge regarding boosters; we also predict that participants under cognitive load will have less vaccine intention and knowledge, as well as more negative attitudes, compared to participants under no load. Finally, we predict that the benefits of general information on intention, attitudes, and knowledge will be even more pronounced for those under cognitive load.
Trial website
Trial related presentations / publications
Public notes

Contacts
Principal investigator
Name 134126 0
A/Prof Carissa Bonner
Address 134126 0
Edward Ford Building A27, University of Sydney, NSW, 2006
Country 134126 0
Australia
Phone 134126 0
+61 2 9351 7125
Fax 134126 0
Email 134126 0
[email protected]
Contact person for public queries
Name 134127 0
A/Prof Carissa Bonner
Address 134127 0
Edward Ford Building A27, University of Sydney, NSW, 2006
Country 134127 0
Australia
Phone 134127 0
+61 2 9351 7125
Fax 134127 0
Email 134127 0
[email protected]
Contact person for scientific queries
Name 134128 0
A/Prof Carissa Bonner
Address 134128 0
Edward Ford Building A27, University of Sydney, NSW, 2006
Country 134128 0
Australia
Phone 134128 0
+61 2 9351 7125
Fax 134128 0
Email 134128 0
[email protected]

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
Yes
What data in particular will be shared?
The anonymous (de-identified) data from individual participants' responses will be shared. Participants will in no way be identifiable from this data.
When will data be available (start and end dates)?
Data will be made available immediately following publication.
No end date determined.
Available to whom?
Data will be made available to the Usyd data repository, which is publicly available.
Available for what types of analyses?
Data will be available for future studies that wish to use it in similar investigations and/or meta analyses.
How or where can data be obtained?
Data can be obtained via the Usyd repository, which is publicly available.
A/Prof Carissa Bonner may be contacted for further details (email: [email protected]).


What supporting documents are/will be available?

No Supporting Document Provided



Results publications and other study-related documents

Documents added manually
No documents have been uploaded by study researchers.

Documents added automatically
No additional documents have been identified.