Fruit and Vegetable ConsumptionNCT02594319
Understanding Mechanisms of Health Behavior
A study testing Monetary incentives and Self monitoring in people with Fruit and Vegetable Consumption and Incentive Interventions, run by University of Colorado, Boulder.
Trial summary
This research seeks to examine psychological factors that may impact relationship between incentives and health behavior engagement, specifically fruit and vegetable consumption. Additionally, it will compare the impact of two different incentive schedules on behavior engagement, one providing immediate rewards (i.e. Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Fruit and Vegetable Consumption, Incentive Interventions
- What is being tested?
- Monetary incentives and Self monitoring
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 61 participants
- Where
- No sites listed yet
- Study dates
- Feb 2015to Jun 2015
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Consume fewer than 5 servings/day of fruits and vegetables
- Daily access to internet for 3 weeks following baseline session
- Have or are willing to create an account on PayPal
Who cannot join
- -
About this study
This research seeks to examine psychological factors that may impact relationship between incentives and health behavior engagement, specifically fruit and vegetable consumption. Additionally, it will compare the impact of two different incentive schedules on behavior engagement, one providing immediate rewards (i.e. rewards received on a daily basis) and another providing delayed rewards (i.e. rewards received at the end of the study period), with a control condition in which no rewards are offered. Study participants will provide reports of their fruit and vegetable consumption each day for three weeks, and in the two incentive conditions, they will receive small monetary rewards for their fruit and vegetable consumption. Following the three week reporting and reward period, participants will complete two additional assessments, measuring psychological constructs and behavior engagement following the cessation of rewards.
- Being tested
- Monetary incentives, Self monitoring
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Monetary incentivesBehavioural
Self monitoringBehavioural
| Study group | Role | What they receive |
|---|---|---|
| Control | Active comparator | Daily reporting of fruit and vegetable consumption Receives: Behavioral: Self monitoring |
| Daily reward | Experimental | Incentives for fruit and vegetable consumption delivered daily Receives: Behavioral: Monetary incentives; Behavioral: Self monitoring |
| Delayed reward | Experimental | Incentives for fruit and vegetable consumption delivered in a lump sum at the end of the intervention Receives: Behavioral: Monetary incentives; Behavioral: Self monitoring |
What is being measured
The primary outcome is the main question the study is designed to answer.
Fruit and Vegetable Consumption, servings per week
Measured: 3 weeks
Perceived Behavioral Control scale score
Measured: 3 weeks
Attitudes scale score
Measured: 3 weeks
Intrinsic Motivation scale score
Measured: 3 weeks
Fruit and vegetable consumption, servings per week
Measured: 5 weeks
Perceived Behavioral Control scale score
Measured: 5 weeks
Attitudes scale score
Measured: 5 weeks
Intrinsic Motivation scale score
Measured: 5 weeks
Secondary outcomes (2)
Perceived Stress Scale score
Measured: 3 weeks
Perceived Stress Scale score
Measured: 5 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted3 Nov 2015 (estimated)
- Study startFeb 2015
- Primary completionJun 2015
- Study completionJun 2015
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Fruit and Vegetable ConsumptionStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 61 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Colorado, Boulder
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Angela Bryan, University of Colorado, Boulder
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02594319
- Sponsor's protocol ID
- 14-0684
- Status last verified
- Jul 2023
- First submitted
- 30 Oct 2015
- Last updated
- 1 Aug 2023
- Results posted
- No
- Data monitoring committee
- No
Publications
Gardiner CK, Bryan AD. Monetary Incentive Interventions Can Enhance Psychological Factors Related to Fruit and Vegetable Consumption. Ann Behav Med. 2017 Aug;51(4):599-609. doi: 10.1007/s12160-017-9882-4.
PubMed 28176150
Study at a glance
From the registry record, last updated by the sponsor on 1 Aug 2023. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Understanding Mechanisms of Health Behavior
- ClinicalTrials.gov ID
- NCT02594319
- Acronym / sponsor ID
- 14-0684
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 61 participants (actual)
- Lead sponsor
- University of Colorado, BoulderUniversity, hospital or other
- Study start
- Feb 2015
- Primary completion
- Jun 2015 (actual)
- Study completion
- Jun 2015 (actual)
- First posted
- 3 Nov 2015 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This research seeks to examine psychological factors that may impact relationship between incentives and health behavior engagement, specifically fruit and vegetable consumption. Additionally, it will compare the impact of two different incentive schedules on behavior engagement, one providing immediate rewards (i.e. rewards received on a daily basis) and another providing delayed rewards (i.e. rewards received at the end of the study period), with a control condition in which no rewards are offered. Study participants will provide reports of their fruit and vegetable consumption each day for three weeks, and in the two incentive conditions, they will receive small monetary rewards for their fruit and vegetable consumption. Following the three week reporting and reward period, participants will complete two additional assessments, measuring psychological constructs and behavior engagement following the cessation of rewards.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Control | Active comparator | Behavioral: Self monitoringDaily reporting of fruit and vegetable consumption |
| Daily reward | Experimental | Behavioral: Monetary incentives, Behavioral: Self monitoringIncentives for fruit and vegetable consumption delivered daily |
| Delayed reward | Experimental | Behavioral: Monetary incentives, Behavioral: Self monitoringIncentives for fruit and vegetable consumption delivered in a lump sum at the end of the intervention |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (3 listed)
- Consume fewer than 5 servings/day of fruits and vegetables
- Daily access to internet for 3 weeks following baseline session
- Have or are willing to create an account on PayPal
Key exclusion criteria (1 listed)
- -
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Monetary incentives | Behavioural | Daily reward, Delayed reward |
| Self monitoring | Behavioural | Control, Daily reward, Delayed reward |
Primary outcome
Fruit and Vegetable Consumption, servings per week
Time frame: 3 weeks
Perceived Behavioral Control scale score
Time frame: 3 weeks
Attitudes scale score
Time frame: 3 weeks
Intrinsic Motivation scale score
Time frame: 3 weeks
Fruit and vegetable consumption, servings per week
Time frame: 5 weeks
Perceived Behavioral Control scale score
Time frame: 5 weeks
Attitudes scale score
Time frame: 5 weeks
Intrinsic Motivation scale score
Time frame: 5 weeks
2 secondary outcomes
Perceived Stress Scale score
Time frame: 3 weeks
Perceived Stress Scale score
Time frame: 5 weeks
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 1 Aug 2023.
- Derived from this study: PubMed 28176150Gardiner CK, Bryan AD. Monetary Incentive Interventions Can Enhance Psychological Factors Related to Fruit and Vegetable Consumption. Ann Behav Med. 2017 Aug;51(4):599-609. doi: 10.1007/s12160-017-9882-4.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
Questions about this trial
What is this clinical trial studying?
A study testing Monetary incentives and Self monitoring in people with Fruit and Vegetable Consumption and Incentive Interventions, run by University of Colorado, Boulder.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 1 Aug 2023. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Fruit and Vegetable Consumption, servings per week (time frame: 3 weeks). The study lists 8 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT02594319, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Aug 2023.