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Trial registered on ANZCTR
Registration number
ACTRN12608000547347
Ethics application status
Approved
Date submitted
16/09/2008
Date registered
29/10/2008
Date last updated
8/08/2012
Type of registration
Retrospectively registered
Titles & IDs
Public title
The assessment of blinding: the case of caffeinated and de-caffeinated coffee
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Scientific title
Can healthy individuals detect the replacement of caffeinated coffee with decaffeinated coffee
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Secondary ID [1]
280992
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New secondary ID. Please modify.
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Universal Trial Number (UTN)
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Trial acronym
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
removal of coffee from diet
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Condition category
Condition code
Other
3865
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0
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Research that is not of generic health relevance and not applicable to specific health categories listed above
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Public Health
4036
4036
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0
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Epidemiology
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Replacing regular coffee with supplied decaffeinated coffee for 1 week. As per inclusion criteria, participants should consume at least 2 cups per day, but no set requirement to consume a specified amount. Both Caffeinated and Decaffeinated coffee will be supplied by The Coffee Roaster.
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Intervention code [1]
3571
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Lifestyle
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Comparator / control treatment
Replacing regular coffee with supplied caffeinated coffee for 1 week. As per inclusion criteria, participants should consume at least 2 cups per day, but no set requirement to consume a specified amount. Both Caffeinated and Decaffeinated coffee will be supplied by The Coffee Roaster.
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Control group
Active
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Outcomes
Primary outcome [1]
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Assessment of blinding using self completed questionnaires, asking "what type of coffee do you think you are drinking"
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Assessment method [1]
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Timepoint [1]
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Day 1, day 3 and day 7
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Secondary outcome [1]
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Assess what factors lead to unblinding using self completed questionnaires asking "why do you think you are drinking this type of coffee?"
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Assessment method [1]
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Timepoint [1]
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Day 1, Day 3 and Day7
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Eligibility
Key inclusion criteria
18 years or older, Drink at least 2 cups of caffeinated coffee per day, ability to personally collect coffee from research staff, have internet access
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Minimum age
18
Years
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Maximum age
No limit
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Sex
Both males and females
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Can healthy volunteers participate?
Yes
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Key exclusion criteria
people will be excluded if they do not meet inclusion criteria
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Study design
Purpose of the study
Educational / counselling / training
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Allocation to intervention
Randomised controlled trial
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Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Participants register online, once eligible will be allocated to the next intervetion group as per randomisation schedule. This schedule will be concealed from investigators until allocation is required using sealed opaque envelopes.
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
computer generated block randomisation.
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Masking / blinding
Blinded (masking used)
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Who is / are masked / blinded?
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Intervention assignment
Parallel
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Other design features
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Phase
Not Applicable
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Type of endpoint/s
Efficacy
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Statistical methods / analysis
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Recruitment
Recruitment status
Completed
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Date of first participant enrolment
Anticipated
1/10/2008
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Actual
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Date of last participant enrolment
Anticipated
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Actual
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Date of last data collection
Anticipated
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Actual
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Sample size
Target
150
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Accrual to date
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Final
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Recruitment in Australia
Recruitment state(s)
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Funding & Sponsors
Funding source category [1]
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Charities/Societies/Foundations
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Name [1]
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Australian Federation of University Women River Group
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Address [1]
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Research Office
University of Sydney,
NSW 2006
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Country [1]
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Australia
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Primary sponsor type
Individual
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Name
A/Prof Alex Barratt
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Address
Edward Ford Building (A27)
University of Sydney
NSW 2006
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Country
Australia
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Secondary sponsor category [1]
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Individual
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Name [1]
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A/Prof Rob Herbert
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Address [1]
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The George Institute
PO Box M201
Missenden Rd,
Camperdown NSW 2050
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Country [1]
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Australia
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
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University of Sydney Human Research Ethics Committee
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Ethics committee address [1]
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Room 313, OTC (A22)
University of Sydney NSW 2006
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Ethics committee country [1]
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Australia
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Date submitted for ethics approval [1]
5931
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Approval date [1]
5931
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Ethics approval number [1]
5931
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11117
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Summary
Brief summary
This is a preliminary study to test methodology for a large intervention trial to be conducted later. This study aims to determine whether participants can be adequately blinded in a study where decaffeinated coffee and caffeinated coffee are the intervention and control conditions. In this study, participants will be randomized to receive either caffeinated or decaffeinated coffee, and be provided with enough coffee for a week. Participants will be asked to replace their regular coffee with the study coffee for one week, and refrain from consuming any other forms of caffeine (tea, cola, chocolate etc). They will not be told which coffee they are drinking, and, at various times throughout the week, they will be asked to guess what coffee they are drinking.
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Trial website
http://www.health.usyd.edu.au/coffeetrial/
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Trial related presentations / publications
Mathieu E, Barratt A, McGeechan K, Herbert R. (2012) Blinding of participants in trials assessing the impact of caffeine removal on health outcomes: the results of an online randomised controlled trial. Australiasian Epidemiologist. 19 (1) April, 28-32
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Public notes
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Contacts
Principal investigator
Name
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Address
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Country
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Phone
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Fax
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Email
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Contact person for public queries
Name
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Erin Mathieu
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Address
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Edward Ford Building (A27)
The University of Sydney, NSW 2006
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Country
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Australia
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Phone
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0293515112
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Fax
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Email
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[email protected]
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Contact person for scientific queries
Name
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Erin Mathieu
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Address
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Edward Ford Building (A27)
The University of Sydney, NSW 2006
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Country
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Australia
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Phone
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0293515112
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Fax
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Email
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[email protected]
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No information has been provided regarding IPD availability
What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
No additional documents have been identified.
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