Excessive Alcohol Consumption and Violent Brawls: A Randomized Controlled Trial with Bartenders in Bogotá, Colombia
Last registered on March 08, 2019

Pre-Trial

Trial Information
General Information
Title
Excessive Alcohol Consumption and Violent Brawls: A Randomized Controlled Trial with Bartenders in Bogotá, Colombia
RCT ID
AEARCTR-0003845
Initial registration date
March 07, 2019
Last updated
March 08, 2019 3:55 PM EST
Location(s)

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Primary Investigator
Affiliation
Universidad de los Andes
Other Primary Investigator(s)
PI Affiliation
Universidad de los Andes
PI Affiliation
Universidad de los Andes
PI Affiliation
Universidad de los Andes
Additional Trial Information
Status
On going
Start date
2018-06-01
End date
2019-04-30
Secondary IDs
Abstract
Excessive alcohol consumption has been shown to instigate violence in public spaces, particularly in and around alcohol-serving establishments. Policies that ban or restrict alcohol have been shown to work but impose restrictions on the community and may be unenforceable. Less evidence exists regarding policies that raise awareness among bartenders and patrons of the adverse consequences of excessive alcohol consumption. In this study we evaluate an intervention conducted by the Bogotá mayor’s office and Colombia’s largest brewery to empower bartenders, provide didactic materials to bar patrons, and offer food and non-alcoholic drinks to bar patrons. The intervention has two primary objectives: i) reduce the negative consequences associated with the overconsumption of alcohol and ii) defuse conflicts between bartenders and patrons, and among patrons, that might escalate to violence within and around bars. Our unit of observation is the street segment, nested within police quadrants. We first randomize 221 police quadrants into treatment and control groups. Second, in the 109 treated quadrants, we randomly select eligible street segments with alcohol-serving establishments to receive the intervention. This design captures both direct effects of the intervention for street segments within treated police quadrants and potential spillover effects across police quadrants.
External Link(s)
Registration Citation
Citation
Camacho, Andres Felipe et al. 2019. "Excessive Alcohol Consumption and Violent Brawls: A Randomized Controlled Trial with Bartenders in Bogotá, Colombia." AEA RCT Registry. March 08. https://www.socialscienceregistry.org/trials/3845/history/42814
Experimental Details
Interventions
Intervention(s)
This randomized controlled trial studies the impact of an intervention directed at bartenders in four neighborhoods or localities in Bogotá, Colombia. The goal of the study is to determine whether alcohol-induced violent brawls can be reduced via a low-cost, scalable intervention undertaken through a public-private partnership between Bogot\'a's mayor's office, Colombia's largest brewery (Bavaria), and the team of researchers. The intervention has two primary objectives: i) reduce the negative consequences associated with the over-consumption of alcohol and ii) defuse conflicts between bartenders and patrons, and among patrons, that might escalate to violence within and around bars.
Intervention Start Date
2018-09-01
Intervention End Date
2018-11-30
Primary Outcomes
Primary Outcomes (end points)
Number of violent brawls
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Alcohol sales, water sales, food sales
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The randomization consists of two stages. Our universe consists of the four selected neighborhoods or localities in Bogotá. Next, within these localities, we identified eligible street segments: those with at least one violent brawl and one bar at a distance equal to or less than 100 meters. In the first stage of the randomization, we randomly selected treatment and control police quadrants. Bogotá is composed of 1,051 police quadrants in total. Selection of quadrants therefore occurred in two phases: first, quadrants with at least two pre-selected street segments (given the criteria described above) were chosen. Subsequently, using the Statistical, Criminal, Contravention and Operational Information System (SIEDCO) from the National Police, we discarded the most dangerous decile of quadrants within the four localities. Across the four localities there are 221 eligible police quadrants in total, 109 were selected into treatment and 112 into the control group.

The second stage of the assignment procedure randomly selects street segments within the 109 treated police quadrants to receive the intervention. Given budget constraints that restricted the number of treated bars to 270, we selected 218 street segments that contained approximately this number of alcohol-serving establishments.
Experimental Design Details
Not available
Randomization Method
Randomization done in office by a computer
Randomization Unit
First stage: Randomization took place at the police quadrant-level
Second stage: Within randomly selected treatment police quadrants, street segments were selected into treatment and control
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
221 Police Quadrants
2539 Street segments
Sample size: planned number of observations
152,340 street segments for 60 months (2539 street segments x 60 months)
Sample size (or number of clusters) by treatment arms
109 treated police quadrants and 112 control police quadrants
218 treated street segments within treated police quadrants and 2321 control street segments
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
MDE for number of violent brawls at police quadrant level: 0.30 SDs. (Mean=16.16, SD=12.06) MDE for number of violent brawls at street segment level: 0.27 SDs. (Mean=3.57, SD=3.19)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Institutional Review Board - Universidad de los Andes
IRB Approval Date
2019-03-07
IRB Approval Number
970
Analysis Plan

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