Behavioral interventions, economic preferences and vaccination uptake

Last registered on August 22, 2021

Pre-Trial

Trial Information

General Information

Title
Behavioral interventions, economic preferences and vaccination uptake
RCT ID
AEARCTR-0007652
Initial registration date
May 27, 2021

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
May 27, 2021, 9:02 AM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Last updated
August 22, 2021, 3:45 PM EDT

Last updated is the most recent time when changes to the trial's registration were published.

Locations

Region

Primary Investigator

Affiliation
University of Zurich

Other Primary Investigator(s)

PI Affiliation
University of Copenhagen
PI Affiliation
University of Lausanne
PI Affiliation
Columbia University
PI Affiliation
University of Chicago
PI Affiliation
Lund University

Additional Trial Information

Status
Completed
Start date
2021-05-27
End date
2021-08-22
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
We study the impact of four interventions to increase COVID-19 vaccination uptake in Sweden.
External Link(s)

Registration Citation

Citation
Campos-Mercade, Pol et al. 2021. "Behavioral interventions, economic preferences and vaccination uptake." AEA RCT Registry. August 22. https://doi.org/10.1257/rct.7652-2.0
Experimental Details

Interventions

Intervention(s)
Intervention Start Date
2021-05-27
Intervention End Date
2021-08-22

Primary Outcomes

Primary Outcomes (end points)
Intention 1 (main outcome measure for intentions): Do you think you will get a first shot of a COVID-19 vaccine within the first month after the vaccine becomes available to you? (No/Yes)

Behavior 1 (main outcome measure for behavior): Did the participant get a first shot of a COVID-19 vaccine within the first month after the vaccine became available to him/her? (0/1)
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
To address our research questions, we conduct a survey with a representative sample of the Swedish population. In the online survey, we first measure participants’ preferences. Then we randomly allocate participants to an intervention. Next, we measure participants' intentions to get vaccinated. Last, we examine whether people did or did not get vaccinated using data from administrative registers.
Experimental Design Details
We describe the design in the preanalysis plan.
Randomization Method
Randomization is done by a computer
Randomization Unit
We randomize at the individual level.
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
We aim to collect data from about 10,000 participants. However, there is some uncertainty about the number of people that the survey provider can recruit, and we could end up with a higher or small sample size. Importantly, we will not have access to the vaccination data until we have finished data collection.
Sample size: planned number of observations
We aim to collect data from about 10,000 participants. However, there is some uncertainty about the number of people that our survey provider can recruit, and we could end up with a higher or small sample size.
Sample size (or number of clusters) by treatment arms
We have a total of six conditions. We allocate 1/3 of the sample size (around 3000 participants) to the control group and 2/15 of the sample size (around 1300 participants) to each other condition.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB

Institutional Review Boards (IRBs)

IRB Name
Etikprövningsmyndigheten Sweden
IRB Approval Date
2021-04-29
IRB Approval Number
2021-01658
Analysis Plan

Analysis Plan Documents

PreAnalysisPlan_v42.pdf

MD5: ab9f76f06e9c1067427db9c26f064c47

SHA1: 3ca6b7fcc323143f5fb1ef7027f7a95bb3b2dd1a

Uploaded At: May 27, 2021

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
No
Data Collection Complete
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials