Evaluating the Effectiveness of Financial Incentives in Promoting Weight Loss Among Obese Individuals.

This study has been completed.
Sponsor:
Collaborators:
William and Flora Hewlett Foundation
USDA Beltsville Human Nutrition Research Center
Information provided by:
University of Pennsylvania
ClinicalTrials.gov Identifier:
NCT00520611
First received: August 22, 2007
Last updated: July 21, 2011
Last verified: January 2010
  Purpose

Obesity is a major cause of premature aging and the second leading cause of preventable mortality in the United States, accounting for approximately 110,000 deaths per year. Financial incentives have been effective in modifying a number of health behaviors but they have rarely been applied to weight loss, and to the best of our knowledge never to weight loss by low-SES obese veterans.

We propose testing two different approaches to using financial incentives to encourage weight loss. In the first, we build on previous work showing the effectiveness of 'deposit contracts', in which subjects are given the opportunity to put their own money at risk if they do not lose weight. In this incentive condition, subjects receive a direct payment conditional on daily weight loss, and an optional additional payment based on their own contributions to the deposit contract. We will match their contribution 1:1 to make the option of depositing their own money attractive to this predominantly low SES population. In the second approach we build on our own prior work using lotteries to promote drug adherence. In this incentive condition, participants are entered into a daily lottery, and receive any payoffs they earn from the lottery only if they stay on track with their weight-loss goal. Given their popularity in the general population, lotteries hold the promise of providing a cost-effective means of motivating weight loss and making efforts to lose weight more salient to obese patients.


Condition Intervention
Obesity
Behavioral: Financial Incentives

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Evaluating the Effectiveness of Financial Incentives in Promoting Weight Loss Among Obese Individuals.

Resource links provided by NLM:


Further study details as provided by University of Pennsylvania:

Primary Outcome Measures:
  • Mean weight loss will be greater in both experimental groups compared to the control group by the end of 16 weeks [ Time Frame: 4 months ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Use the difference in weight loss measured at 16 weeks to project the long-term cost-effectiveness if weight loss is sustained [ Time Frame: 4 Months ] [ Designated as safety issue: No ]

Estimated Enrollment: 57
Study Start Date: June 2007
Study Completion Date: December 2009
Primary Completion Date: June 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Lottery
Participants are entered into daily lotteries to win $10 or $100 every day their weight is at or below daily targets.
Behavioral: Financial Incentives
Participants call in their weight on daily basis. Participants must report under their daily targets to qualify for entry into lottery. Call-in weights are verified at monthly weigh-ins.
Active Comparator: Deposit
Participants receive $3/day if they are at or below their daily weight goals, plus have opportunity to deposit up to $3/day of their own money, which is then matched 1:1 every day they are at or below their daily weight goals.
Behavioral: Financial Incentives
Participants call in their weight on daily basis. Participants must report under their daily targets to qualify to receive daily incentive. Call-in weights are verified at monthly weigh-ins.
No Intervention: Control
Participants would receive usual care from their providers and have monthly weigh ins.

  Show Detailed Description

  Eligibility

Ages Eligible for Study:   30 Years to 70 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • BMI between 30-40;
  • Age between 30-70;
  • At least moderately interested in losing weight (Self-reported 3,4, or 5 on 5 point scale)

Exclusion Criteria:

  • Unstable medical conditions that would likely prevent the subject from completing the study;
  • Myocardial infarction within 6 months;
  • Uncontrolled hypertension, defined as BP>170 mm Hg systolic or BP>110 mm Hg diastolic;
  • Metastatic cancer;
  • Self-report of 6 or more alcoholic beverages per day;
  • Severe depression;
  • Active substance abuse;
  • Schizophrenia
  • Inability to read or severe cognitive deficits that would preclude ability to read consent form or fill out surveys).
  • Baseline participation in other weight loss programs.
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT00520611

Locations
United States, Pennsylvania
Center for Health Equity Research and Promotion
Philadelphia, Pennsylvania, United States, 19104
Sponsors and Collaborators
University of Pennsylvania
William and Flora Hewlett Foundation
USDA Beltsville Human Nutrition Research Center
Investigators
Principal Investigator: Kevin Volpp, MD, PhD Univesity of Pennsylvania
Study Director: George Loewenstein, PhD Carnegie Mellon University
Study Director: Leslie John, PhD cand. Carnegie Mellon University
  More Information

No publications provided by University of Pennsylvania

Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Dr. Kevin Volpp, University of Pennsylvania
ClinicalTrials.gov Identifier: NCT00520611     History of Changes
Other Study ID Numbers: 00985
Study First Received: August 22, 2007
Last Updated: July 21, 2011
Health Authority: United States: Institutional Review Board

Keywords provided by University of Pennsylvania:
Obesity
Weight Loss
Financial Incentives
Lottery
Deposit

Additional relevant MeSH terms:
Obesity
Weight Loss
Body Weight
Body Weight Changes
Nutrition Disorders
Overnutrition
Overweight
Signs and Symptoms

ClinicalTrials.gov processed this record on October 20, 2014