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Save a contact, save your contacts: A natural field experiment of nudges for contact tracing participation
Last registered on January 06, 2021

Pre-Trial

Trial Information
General Information
Title
Save a contact, save your contacts: A natural field experiment of nudges for contact tracing participation
RCT ID
AEARCTR-0006990
Initial registration date
January 05, 2021
Last updated
January 06, 2021 10:02 AM EST
Location(s)

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Primary Investigator
Affiliation
University of Chicago
Other Primary Investigator(s)
PI Affiliation
University of Chicago
Additional Trial Information
Status
In development
Start date
2021-01-11
End date
2022-02-28
Secondary IDs
Abstract
Mailing experiment to study what nudges work to improve participation in Covid-19 contact tracing.
External Link(s)
Registration Citation
Citation
Birke, David and Ariel Listo. 2021. "Save a contact, save your contacts: A natural field experiment of nudges for contact tracing participation." AEA RCT Registry. January 06. https://doi.org/10.1257/rct.6990-1.0.
Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2021-01-11
Intervention End Date
2021-02-28
Primary Outcomes
Primary Outcomes (end points)
In collaboration with the city's health department, we measure response rates and completion of initial and follow-up contact tracing calls and interviews, separately for both positively tested cases and high-risk contacts. We link these outcomes to postal routes using individual residential addresses.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
N/A
Experimental Design Details
Not available
Randomization Method
Done by a computer, see attached code
Randomization Unit
Treatment is assigned to postal routes. Outcomes are observed at the individual level, which is linked to the postal route using the individual's residential address.
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
652 postal routes
Sample size: planned number of observations
Approximately 20,000-50,000 cases or contacts, depending on the number of cases and high-risk contacts that will be reported to the city's contact tracing team over January and February. Additional observations will come from retrospective pre-treatment data.
Sample size (or number of clusters) by treatment arms
Around half in control and 1/12 in each of the 6 treatments. Exact number will depend on the number of cases and high-risk contacts that will be reported to the city's contact tracing team.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials

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IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
The University of Chicago Institutional Review Board
IRB Approval Date
2020-12-22
IRB Approval Number
IRB20-2101
Analysis Plan

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