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Nudging Youth to Stay Safe: Summer Messaging Campaigns
Last registered on May 21, 2018

Pre-Trial

Trial Information
General Information
Title
Nudging Youth to Stay Safe: Summer Messaging Campaigns
RCT ID
AEARCTR-0002967
Initial registration date
May 17, 2018
Last updated
May 21, 2018 10:43 AM EDT
Location(s)
Region
Primary Investigator
Affiliation
University of Chicago Crime Lab
Other Primary Investigator(s)
PI Affiliation
University of Chicago Crime Lab
PI Affiliation
Booth School of Business
Additional Trial Information
Status
On going
Start date
2017-05-01
End date
2018-09-30
Secondary IDs
Abstract
In Chicago, many homicides stem from altercations that spiral out of control. How can we help youth avoid the kinds of automatic behavior that can be dangerous or deadly in high-crime urban neighborhoods? In this study, we worked to test whether text messages encouraging youth to slow down and think can help them and make safer decisions, particularly in high-stakes moments.
External Link(s)
Registration Citation
Citation
Cooke, Brice, Aurelie Ouss and Anuj Shah. 2018. "Nudging Youth to Stay Safe: Summer Messaging Campaigns." AEA RCT Registry. May 21. https://doi.org/10.1257/rct.2967-1.0.
Former Citation
Cooke, Brice et al. 2018. "Nudging Youth to Stay Safe: Summer Messaging Campaigns." AEA RCT Registry. May 21. http://www.socialscienceregistry.org/trials/2967/history/29753.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2017-08-01
Intervention End Date
2017-09-30
Primary Outcomes
Primary Outcomes (end points)
Self-reported safety (see analysis plan for more details).
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Arrests and victimization, measured using administrative data.
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The study uses an individual-level RCT design, in which youth are randomly assigned into one of two groups:

C Control group [Placebo non-safety-related inspirational messages]
T Behaviorally-informed safety messages

Experimental Design Details
Randomization Method
Randomization was done in-office by a computer.
Randomization Unit
We randomized individual youth to the possible treatment arms.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
N/A
Sample size: planned number of observations
Approximately 26,000 youth are randomized to receive text messages. We anticipate that between 700 and 1,000 youth will have responded to surveys for each experiment. The sample are the 33,000 youth who applied to the City of Chicago’s Department of Family and Support Services One Summer Chicago (OSC) summer jobs and mentorship program, who also provided a cell phone number and opted in to receiving the text message intervention. By the time of intervention delivery in August 2017, approximately 26,000 youth remained opted-in to receiving text messages. For the experiment, we will keep people who were still in the study and were randomized to a treatment arm at that time, and we remove from our analyses youth who did not receive any text message for that experiment.
Sample size (or number of clusters) by treatment arms
Approximately 13,000 youth in each treatment arm. We anticipate that between 230 and 500 youth in each treatment arm will have responded to surveys for each experiment.
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
University of Chicago
IRB Approval Date
2016-06-29
IRB Approval Number
IRB16-0879
Analysis Plan

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Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is 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