Organ Donation Survey Experiment

Last registered on June 01, 2021

View Trial History

Pre-Trial

Trial Information

General Information

Title

Organ Donation Survey Experiment

RCT ID

AEARCTR-0007753

Initial registration date

May 31, 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

June 01, 2021, 10:25 AM EDT

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

Locations

Country

Australia

Region

Primary Investigator

Name

BETA Team Registration

Affiliation

Behavioural Economics Team of the Australian Government

Contact Primary Investigator

Other Primary Investigator(s)

Additional Trial Information

Status

Completed

Start date

2021-05-25

End date

2021-05-27

Keywords

Behavior, Health

Additional Keywords

Behavioural insights

JEL code(s)

Secondary IDs

Abstract

This study will examine the effectiveness of various behaviourally informed messages to encourage people to register as organ donors.

External Link(s)

Registration Citation

Citation

Team Registration, BETA. 2021. "Organ Donation Survey Experiment." AEA RCT Registry. June 01. https://doi.org/10.1257/rct.7753-1.0

Sponsors & Partners

Experimental Details

Interventions

Intervention(s)

Two different behaviourally informed messages (plus a control message) encouraging organ donor registration will be displayed to participants.

Intervention Start Date

2021-05-25

Intervention End Date

2021-05-27

Primary Outcomes

Primary Outcomes (end points)

Registering as an organ donor on the Donate Life webform.

Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)

Clicked on the link to the webform signup (binary), stated likelihood of registering this week (binary, those that say they ‘definitely’ will + that they ‘just did a moment ago’ = 1)

Secondary Outcomes (explanation)

Experimental Design

A three-arm survey experiment, randomised at the individual level.

Experimental Design Details

A three-arm survey experiment, randomised at the individual level.
Participants will be screened, so that only people who state that they want to be organ donors, but have not registered, will participate. They will be shown one of three different messages designed to encourage organ donation registration. They will also be presented with a link to a webform that can be used to register. It will be made clear that registration is voluntary, and that they do not need register in order to complete the survey. They will also be asked for their views on the message they were presented with.
We have three hypotheses
H1. Treatment group 1 registrations > Control group registrations
H2. Treatment group 2 registrations > Control group registrations
H3. Treatment group 1 registrations ≠ Treatment group 2 registrations
H1 and H2 are directional hypotheses and we be tested using one-tailed tests, H3 will be tested with a two tail test. We will use same hypotheses for the secondary measures
Note that we do not propose to adjust for multiple hypothesis testing

Randomization Method

Randomisation will be at the level of individual survey participants. Individuals will be randomly assigned to the three treatment groups using complete random assignment. Assignment will be balanced (that is, an equal number in each treatment group) to the extent that the sample size allows.

Randomisation will be implemented via within the survey platform Qualtrics, with equal probabability of assignment across the three groups

Randomization Unit

individual

Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters

approx 700 individuals

Sample size: planned number of observations

approx 700 individuals

Sample size (or number of clusters) by treatment arms

approx 230 individuals in each of the three trial arms

Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

We performed power calculations that indicated that at an alpha of 5% we will have 80% power to detect a standardised effect of 0.261. If we assume that the control group has a registration rate of 1%, this would be equivalent to a 4.25pp increase for treatment groups 1 or 2.

Supporting Documents and Materials

IRB