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Social Norms for COVID-19 Vaccination
Last registered on June 11, 2021

Pre-Trial

Trial Information
General Information
Title
Social Norms for COVID-19 Vaccination
RCT ID
AEARCTR-0007634
Initial registration date
May 05, 2021
Last updated
June 11, 2021 12:09 PM EDT
Location(s)
Primary Investigator
Affiliation
Montana State University
Other Primary Investigator(s)
Additional Trial Information
Status
On going
Start date
2021-05-05
End date
2021-08-31
Secondary IDs
Abstract
This study uses a survey-based experiment to test how the provision of descriptive social norm information, namely, the share of other study participants who intend to receive COVID-19 vaccinations, influences a student's perceptions of COVID-19 and stated intention of vaccination.
External Link(s)
Registration Citation
Citation
Carrera, Mariana. 2021. "Social Norms for COVID-19 Vaccination." AEA RCT Registry. June 11. https://doi.org/10.1257/rct.7634-1.2000000000000002.
Experimental Details
Interventions
Intervention(s)
A randomized information treatment presents the share of participants from an earlier survey wave who answered that they are already vaccinated or intend to receive their COVID-19 vaccination by June 30, 2021.
Intervention Start Date
2021-05-05
Intervention End Date
2021-06-30
Primary Outcomes
Primary Outcomes (end points)
Stated intention to vaccinate against COVID-19, Subjective probability of vaccination by June 30, Estimated percent of students at same university who will be fully vaccinated at the start of fall semester, and Expected number of cases of COVID-19 at the university in Fall 2021.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Perceptions of risks of COVID-19 vaccines, Vaccination by June 30 if not yet vaccinated at time of survey, Clicking on links offered to learn more about COVID vaccination and COVID infection or to schedule an appointment for vaccination.
Secondary Outcomes (explanation)
A number of questions regarding COVID-19 vaccination risks and side effects will be normalized and averaged for this secondary outcome. For a subset of consented participants, vaccination records will be searched through the state registry.
Experimental Design
Experimental Design
In this survey-based experiment, students are first asked to guess the share of participants who have been, or intend to be, vaccinated against COVID-19. They are then randomized into an information treatment and control group. The information treatment group sees information on the responses of past participants. Then, all participants are asked to state whether they intend to be vaccinated against COVID-19, have already been vaccinated, are undecided, or are not interested in vaccinated.
Experimental Design Details
Not available
Randomization Method
Qualtrics block randomization
Randomization Unit
Individual
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
1 school
Sample size: planned number of observations
500-1000 students
Sample size (or number of clusters) by treatment arms
One half receiving information treatment
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Montana State University
IRB Approval Date
2021-05-03
IRB Approval Number
MC050321-FC