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Nudging with reminders – the role of beliefs and emotions
Last registered on March 23, 2019

Pre-Trial

Trial Information
General Information
Title
Nudging with reminders – the role of beliefs and emotions
RCT ID
AEARCTR-0004018
Initial registration date
March 18, 2019
Last updated
March 23, 2019 8:12 PM EDT
Location(s)

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Primary Investigator
Affiliation
University of Copenhagen
Other Primary Investigator(s)
PI Affiliation
WZB
PI Affiliation
Aarhus University
Additional Trial Information
Status
In development
Start date
2019-03-18
End date
2019-10-31
Secondary IDs
Abstract
This study aims to identify the potential risks that can result from using one of the most popular nudges, reminders, to change behavior. We analyze what drives reminder response and in particular the role of reminders as a means to overcome attentional problems, informational limitations or invoke emotions such as guilt or reassurance. The method of research is a large-scale field experiment.
External Link(s)
Registration Citation
Citation
Barron, Kai , Christina Gravert and Mette Trier Damgaard. 2019. "Nudging with reminders – the role of beliefs and emotions." AEA RCT Registry. March 23. https://doi.org/10.1257/rct.4018-1.0.
Former Citation
Barron, Kai , Christina Gravert and Mette Trier Damgaard. 2019. "Nudging with reminders – the role of beliefs and emotions." AEA RCT Registry. March 23. https://www.socialscienceregistry.org/trials/4018/history/43952.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
We are working together with a mobile-health provider in Cape Town to study the effect of text message reminders on medication adherence for pregnant women.
Intervention Start Date
2019-03-19
Intervention End Date
2019-06-30
Primary Outcomes
Primary Outcomes (end points)
Response rates to the incentivized tasks
Unsubscription from the messages
Willingness to pay for reminders
Observed time preferences from a task
Primary Outcomes (explanation)
The time preferences will be elicited in a task in which the subjects have to write words backward to earn money, they earlier they do the task, the less work it is. We will measure how early they do the task and whether this is consistent with their stated intentions on when to do the task.
Secondary Outcomes
Secondary Outcomes (end points)
Stated adherence
Stated beliefs about the importance of iron supplements
Stated anemia symptoms
Quiz test results
Secondary Outcomes (explanation)
There will be several survey outcomes, which will serve as a complement to the main behavioral outcomes and the willingness to pay.
Experimental Design
Experimental Design
Over the course of 3 months, a randomly selected subset of pregnant women will receive text messages with health information. There will be 6 treatment arms. We will measure their engagement with the program as well as their responses to incentivized tasks and their answers to quiz and survey questions.
Experimental Design Details
Not available
Randomization Method
We will draw a random sample of ca 15,000 mothers from the population of all pregnant women in South Africa who are signed-up to the MomConnect program. Randomization will be done by the software RapidPro.
Randomization Unit
After consent, mothers will be randomly assigned to one of the 6 treatments. Within the treatment 6, there will be an additional sub-experiment where mothers will be randomized into 4 incentive levels for one of the sub-tasks.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
No clusters
Sample size: planned number of observations
15,000 women will be invited.
Sample size (or number of clusters) by treatment arms
2500 mothers per groups will be invited. We anticipate a response rate of 25%, so 625 mothers per treatment arm.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Because variation in outcomes is hard to anticipate, we did not do a formal power calculation.
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Pharma Ethics
IRB Approval Date
2019-01-10
IRB Approval Number
181021588
Analysis Plan

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