Improving Job Safety: The Impact of Providing Information to Firms and Workers in Chile
Last registered on September 01, 2014


Trial Information
General Information
Improving Job Safety: The Impact of Providing Information to Firms and Workers in Chile
Initial registration date
September 01, 2014
Last updated
September 01, 2014 11:44 AM EDT
Primary Investigator
Pontificia Universidad Catolica de Chile
Other Primary Investigator(s)
PI Affiliation
PI Affiliation
Additional Trial Information
On going
Start date
End date
Secondary IDs
This trial measures the impact of the delivery of information about accidentability to SMEs in their implementation of labor security practices, participation in trainings and their accidentability rates. Four different treatments were applied which differ in the kind of information given, the way it is delivered and to whom it is directed (entrepreneurs, security managers or directly to the workers). The enterprises in the experiment are part of the SME Program of the Chilean Security Association (ACHS) and they had all been visited by the ACHS´s expert the month before de intervention.
External Link(s)
Registration Citation
Brahm, Francisco, Jeanne Lafortune and José Tessada. 2014. "Improving Job Safety: The Impact of Providing Information to Firms and Workers in Chile." AEA RCT Registry. September 01.
Former Citation
Brahm, Francisco et al. 2014. "Improving Job Safety: The Impact of Providing Information to Firms and Workers in Chile." AEA RCT Registry. September 01.
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Experimental Details
The desing included two randomizarions. The first one was performed between april and october, and focused on delivering the information to the person in charge of the enterprise by e-mail with three different contents:
Treatment 1: simplified version of the ACHS plan of action
Treatment 2: comparative information of the accidentability rate of the enterprise related to this rate in the SMEs of the same sector.
Treatment 3: information and consciousness about the costs implied in labor accidents.
Treatment 4: sent printed material to be given out to the workers and used as a poster
Intervention Start Date
Intervention End Date
Primary Outcomes
Primary Outcomes (end points)
Accidentability rate 2 months after sending the e-mail
Accidentability rate 6 months after sending the e-mail
Training courses in labor security during 2013
Accomplishment of legal requirements
Average wages of workers
Workers characteristics
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The design included two stages. On the first one, the enterprises were selected for receiving one of the four kinds of e-mail information or to control group. On a second ocassion, the were assigned to receiving physicall mail or not receiving it.
Experimental Design Details
Randomization Method
Computer system.
Randomization Unit
Was the treatment clustered?
Experiment Characteristics
Sample size: planned number of clusters
Regions and industries.
Sample size: planned number of observations
31.500 enterprises
Sample size (or number of clusters) by treatment arms
First randomization:
Treatment 1: 2.000 enterprises
Treatment 1: 3.500 enterprises
Treatment 1: 3.500 enterprises
Control: 3.500 enterprises
Second randomization
Treatment 4: 5.000 enterprises
Control: 5.000 enterprises
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
First randomization (e-mails) Accidentability rate: 0,71% Percentage: 12,95% Completing training courses: 1,74% Percentage: 26,33% Legal plan accomplishment:1,72% Percentage: 2,35% Second randomization (printed material) Accidentability rate: 0,65% Percentage: 11,88% Completing training courses: 1,59% Percentage: 24,16% Legal plan accomplishment:1,58% Percentage: 2,15%
Post Trial Information
Study Withdrawal
Is the intervention completed?
Is data collection complete?
Data Publication
Data Publication
Is public data available?
Program Files
Program Files
Reports, Papers & Other Materials
Relevant Paper(s)