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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Type of registration
Retrospectively registered

Titles & IDs
Public title
Assessing the impact of a sweetened beverage tax in Australia
Scientific title
Assessing the impact of a 10%, 20% and 30% increase in the price of sweetened drinks, versus no increase, on the purchase intentions of beverages for household consumption.
Secondary ID [1] 259687 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Obesity 261256 0
diet 261257 0
Nutrition 261258 0
Condition category
Condition code
Public Health 259412 259412 0 0
Other public health

Study type
Description of intervention(s) / exposure
Participants allocated to the one of three beverage tax conditions.

During a telephone survey, participants will be read a list of beverages typically available from an Australian supermarket. The survey will be conducted once only.

For each beverage product type, participants will be provided with information about the price and container sizes (up to three) which the product can be purchased (for example, a 2 litre bottle, a 1.5 litre bottle and a 600ml bottle) based on data regarding the most frequently purchased container size for that beverage product.

For each beverage type, participants will be asked to report the number of products (in each container size), they would intend to purchase for the consumption of their household during a typical grocery shop.

The price of beverages containing caloric sweetener will be experimentally manipulated.

For group 1: the price of such products will be increased by 10%

For group 2: the price of such products will be increased by 20%

For group 3: the price of such products will be increased by 30%
Intervention code [1] 258115 0
Intervention code [2] 264185 0
Comparator / control treatment
The comparison group (group 4) procedure will be identical to those in the intervention conditions, however the price of beverages read to control group participants will not be inflated, and will be at current market price
Control group

Primary outcome [1] 262216 0
Mean Kilojoules per household of beverages intended to be purchased for household consumption (by group)
Timepoint [1] 262216 0
This is a cross sectional survey so there is only one time point. Data will be assessed once all the survey results have been collected
Secondary outcome [1] 273346 0
Timepoint [1] 273346 0

Key inclusion criteria
Participants will be sampled from a cohort of adults previously recruited into a random household general health telephone survey and who agreed to be approach for future opportunities for research participation. Additionally, to be eligible, participants must be 16 years or older be able to converse in English and have some current responsibility for household grocery shopping.
Minimum age
16 Years
Maximum age
No limit
Both males and females
Can healthy volunteers participate?
Key exclusion criteria

Study design
Purpose of the study
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Participants will be telephoned and approached to participate in the study. Participants will be randomly allocated into 4 groups in a ratio of 1:1:1:1
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
the randomisation procedure will be generated using computer software built into the the computerised telephone survey system
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?

Intervention assignment
Other design features
Not Applicable
Type of endpoint(s)
Statistical methods / analysis

Recruitment status
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)

Funding & Sponsors
Funding source category [1] 258572 0
Name [1] 258572 0
University of Newcastle
Address [1] 258572 0
The University of Newcastle
University Dr, Callaghan, NSW, 2308
Country [1] 258572 0
Primary sponsor type
Luke Wolfenden
The University of Newcastle
School of Medicine and Public Health
University Dr, Callaghan, NSW, 2308
Secondary sponsor category [1] 257712 0
Name [1] 257712 0
Address [1] 257712 0
Country [1] 257712 0
Other collaborator category [1] 251834 0
Government body
Name [1] 251834 0
Hunter New England Population Health
Address [1] 251834 0
Hunter New England Population Health
Longworth Ave, Wallsend, NSW, 2287
Country [1] 251834 0

Ethics approval
Ethics application status
Ethics committee name [1] 260556 0
Hunter New England Human Research Ethics Committee
Ethics committee address [1] 260556 0
Hunter New England Human Research Ethics Committee
Hunter New England Health
Locked Bag 1
New Lambton NSW 2305
Ethics committee country [1] 260556 0
Date submitted for ethics approval [1] 260556 0
Approval date [1] 260556 0
Ethics approval number [1] 260556 0

Brief summary
Participants, responsible for the grocery shopping of their household will be recruited via telephone and randomised to receive one of four groups. All participants will be read a list of beverages frequently purchased from Australian supermarkets and asked the quantity of each they would intend to purchase during a typical grocery shop. The price of caloric sweetened beverages read to participants will be 10%, 20% and 30% higher then the market price for groups randomly allocated to group 1, 2 and 3 respectively. The price of beverages for participants allocated to the comparison group (group 4) will be consistent with market price. All participants will provide data regarding their intended purchase of beverages during the telephone survey.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 32276 0
Address 32276 0
Country 32276 0
Phone 32276 0
Fax 32276 0
Email 32276 0
Contact person for public queries
Name 15523 0
luke wolfenden
Address 15523 0
C/O Hunter New England Population Health, Locked Bag 10, Wallsend, NSW, 2287
Country 15523 0
Phone 15523 0
Fax 15523 0
Email 15523 0
Contact person for scientific queries
Name 6451 0
luke wolfenden
Address 6451 0
C/O Hunter New England Population Health, Locked Bag 10, Wallsend, NSW, 2287
Country 6451 0
Phone 6451 0
Fax 6451 0
Email 6451 0

No information has been provided regarding IPD availability
Summary results
Have study results been published in a peer-reviewed journal?
Other publications
Have study results been made publicly available in another format?
Results – basic reporting
Results – plain English summary