Evaluation of the Impact of a Sugar-Sweetened Beverage Tax in Chile

October 5, 2016 updated by: Marc Suhrcke

Empirical Evaluation of the Short Term Impact of a Sugar-Sweetened Beverage Tax in Chile

The purpose of this study is to evaluate formally the short term impacts of the tax policy applied to Sugar-Sweetened Beverages (SSBs) in Chile. The Impuesto Adicional a las Bebidas Analcohólicas (IABA, or "additional tax on soft drinks") in Chile was enacted in October 2014, affecting any non-alcoholic beverages to which colorants, flavourings or sweeteners have been added. For beverages above an added sugar concentration of at least 6.25 grams per 100ml (or equivalent proportion), the tax was increased from 13% to 18%, while for those below this threshold the tax was decreased to 10%, producing an 8% tax difference between these beverage groups. This impact evaluation analysis of the Chilean sugar-sweetened beverage (SSB) tax will estimate the impact of increasing the tax as well as decreasing the tax on soft drinks. The study will use household level grocery purchasing data for Chile. The purchasing records are available from October 2011 to September 2015 (three years before; and one year after the implementation of the tax in October 2014). The investigators will use a series of quasi-experimental approaches to evaluate the causal impact of the SSB tax policy on consumers' behaviour as well as on industry responses in the form of pricing and price promotion decisions.

Study Overview

Status

Completed

Conditions

Study Type

Observational

Enrollment (Actual)

2836

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

The study population is 2,836 households that arenationally representative of urban areas in Chile.

Description

Inclusion Criteria:

  • Household in Chile that agreed to participate in the purchasing survey and provided data to a satisfactory degree for the first 2 months.

Exclusion Criteria:

  • Households that are unwilling to participate in the survey. Households that change physical address. Households with poor compliance to the survey.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Volume of sugar-sweetened beverage purchased
Time Frame: October 2011 - September 2015
October 2011 - September 2015

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Consumer shopping patterns - Frequency
Time Frame: October 2011 - September 2015
Frequency of Purchasing
October 2011 - September 2015
Consumer shopping patterns - Volume
Time Frame: October 2011 - September 2015
Volume of Purchases
October 2011 - September 2015
Market price of sugar-sweetened beverages
Time Frame: October 2011 - September 2015
October 2011 - September 2015
Body mass index of household members
Time Frame: October 2011 - September 2015
October 2011 - September 2015

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Marc Suhrcke

Collaborators

University of Chile

Investigators

  • Principal Investigator: Marc Suhrcke, PhD, Centre for Health Economics, University of York
  • Principal Investigator: Ryota Nakamura, PhD, Centre for Health Economics, University of York
  • Principal Investigator: Andrew J Mirelman, PhD, Centre for Health Economics, University of York
  • Principal Investigator: Cristobal Cuadrado, MD, PhD, University of Chile
  • Principal Investigator: Nicolas Silva, MD, University of Chile

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

October 1, 2011

Primary Completion (Actual)

September 1, 2015

Study Completion (Actual)

September 1, 2015

Study Registration Dates

First Submitted

October 4, 2016

First Submitted That Met QC Criteria

October 5, 2016

First Posted (Estimate)

October 6, 2016

Study Record Updates

Last Update Posted (Estimate)

October 6, 2016

Last Update Submitted That Met QC Criteria

October 5, 2016

Last Verified

October 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • MR/N026640/1

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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