The impact of refractive error correction on harvest workers in the Guatemalan coffee sector

Last registered on February 27, 2024
View Trial History

Pre-Trial

Trial Information

General Information

Title
The impact of refractive error correction on harvest workers in the Guatemalan coffee sector
RCT ID
AEARCTR-0012852
Initial registration date
January 17, 2024

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
January 19, 2024, 2:18 PM EST

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Last updated
February 27, 2024, 6:01 PM EST

Last updated is the most recent time when changes to the trial's registration were published.

Locations

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Primary Investigator

Name
Andrew Hobbs
Affiliation
Contact Primary Investigator

Other Primary Investigator(s)

PI Name
Bryce Everett
PI Affiliation
Contact Investigator
PI Name
Bruce Wydick
PI Affiliation
PI Name
Travis Lybbert
PI Affiliation
PI Name
Kevin Frick
PI Affiliation
PI Name
Brad Wong
PI Affiliation

Additional Trial Information

Status
On going
Start date
2023-12-01
End date
2024-06-30
Keywords
Agriculture, Health
Additional Keywords
JEL code(s)
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
The purpose of this research is to measure the impact of vision correction on the productivity of harvest workers in the Guatemalan coffee sector.
External Link(s)

Registration Citation

Citation
Everett, Bryce et al. 2024. "The impact of refractive error correction on harvest workers in the Guatemalan coffee sector." AEA RCT Registry. February 27. https://doi.org/10.1257/rct.12852-1.1
Sponsors & Partners
Experimental Details

Interventions

Intervention(s)
Intervention Start Date
2023-12-21
Intervention End Date
2024-03-31

Primary Outcomes

Primary Outcomes (end points)
Coffee cherries harvested (measured by weight).
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
The purpose of this research is to measure the impact of vision correction on the productivity of harvest workers in the Guatemalan coffee sector. Productivity will be measured as the daily quantity of cherries picked during the harvest season. Secondary outcomes include measures of worker wellbeing, optimism and aspirations.
Experimental Design Details
Not available
Randomization Method
Done by a computer
Randomization Unit
Individual
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
Treatment is not clustered.
Sample size: planned number of observations
1000-2000
Sample size (or number of clusters) by treatment arms
Depends on the share of individuals who need corrective lenses (see pre-analysis plan for more details).
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials

Documents

Document Name
Amendment 1
Document Type
other
Document Description
Some changes were made to our analysis plan due to conditions in the field. This plan was filed on February 27, 2024, before post-treatment data was received.
File
Amendment 1

MD5: 8f160d6110df9a1f1222e0d704b8cb70

SHA1: fb9dedcc15c331fa64e704447b025a1ea33ef6fc

Uploaded At: February 27, 2024

IRB

Institutional Review Boards (IRBs)

IRB Name
Univers
IRB Approval Date
2023-10-14
IRB Approval Number
1978
Analysis Plan

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