NCT03192254

Brief 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. 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. The study will also examine how cognitive and anthropomorphic factors may contribute to intervention response and the effects on psychological constructs.

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
68

participants targeted

Target at P50-P75 for not_applicable

Timeline
Completed

Started Jul 2017

Shorter than P25 for not_applicable

Geographic Reach
1 country

1 active site

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

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Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

June 16, 2017

Completed
4 days until next milestone

First Posted

Study publicly available on registry

June 20, 2017

Completed
23 days until next milestone

Study Start

First participant enrolled

July 13, 2017

Completed
7 months until next milestone

Primary Completion

Last participant's last visit for primary outcome

February 21, 2018

Completed
1 month until next milestone

Study Completion

Last participant's last visit for all outcomes

March 30, 2018

Completed
Last Updated

August 1, 2023

Status Verified

July 1, 2023

Enrollment Period

7 months

First QC Date

June 16, 2017

Last Update Submit

July 27, 2023

Conditions

Overweight and ObesityDiet ModificationIncentives

Outcome Measures

Primary Outcomes (6)

  • Fruit and vegetable consumption, servings per week

    3 Weeks

  • Fruit and vegetable consumption, servings per week

    5 Weeks

  • Perceived behavioral control scale score

    3 Weeks

  • Perceived behavioral control scale score

    5 Weeks

  • Attitude scale score

    3 Weeks

  • Attitude scale score

    5 Weeks

Secondary Outcomes (2)

  • Intrinsic motivation scale score

    3 Weeks

  • Intrinsic motivation scale score

    5 Weeks

Study Arms (3)

Self-Monitoring Control

ACTIVE COMPARATOR

Daily tracking of fruit and vegetable consumption

Behavioral: self-monitoring

Daily Incentives

EXPERIMENTAL

Incentives for fruit and vegetable consumption delivered daily

Behavioral: self-monitoringBehavioral: daily monetary incentives

Delayed Lump Sum Incentives

EXPERIMENTAL

Incentives for fruit and vegetable consumption delivered in a lump sum at the end of the intervention

Behavioral: self-monitoringBehavioral: delayed lump sum monetary incentives

Interventions

self-monitoringBEHAVIORAL

recording fruit and vegetable consumption

Daily IncentivesDelayed Lump Sum IncentivesSelf-Monitoring Control
daily monetary incentivesBEHAVIORAL

daily payments for consuming fruits and vegetables

Daily Incentives
delayed lump sum monetary incentivesBEHAVIORAL

lump sum payments for consuming fruits and vegetables

Delayed Lump Sum Incentives

Eligibility Criteria

Age18 Years+
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Consume fewer than 3 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
  • BMI greater than or equal to 25, from self-reported height and weight

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

University of Colorado Boulder

Boulder, Colorado, 80309, United States

Location

MeSH Terms

Conditions

OverweightObesity

Interventions

Blood Glucose Self-Monitoring

Condition Hierarchy (Ancestors)

OvernutritionNutrition DisordersNutritional and Metabolic DiseasesBody WeightSigns and SymptomsPathological Conditions, Signs and Symptoms

Intervention Hierarchy (Ancestors)

Blood Chemical AnalysisClinical Chemistry TestsClinical Laboratory TechniquesDiagnostic Techniques and ProceduresDiagnosisDiagnostic Techniques, EndocrineMonitoring, PhysiologicSelf-TestingSelf CareTherapeuticsInvestigative Techniques

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
SINGLE
Who Masked
PARTICIPANT
Purpose
BASIC SCIENCE
Intervention Model
PARALLEL
Sponsor Type
OTHER
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
Professor

Study Record Dates

First Submitted

June 16, 2017

First Posted

June 20, 2017

Study Start

July 13, 2017

Primary Completion

February 21, 2018

Study Completion

March 30, 2018

Last Updated

August 1, 2023

Record last verified: 2023-07

Data Sharing

IPD Sharing
Will not share

Locations

US(1)