University Of Pennsylvania Weight Loss Study
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|ClinicalTrials.gov Identifier: NCT01167634|
Recruitment Status : Completed
First Posted : July 22, 2010
Results First Posted : August 23, 2017
Last Update Posted : August 23, 2017
This is a 4-arm, randomized controlled trial to evaluate the effectiveness of financial incentives to motivate and sustain long-term weight loss. The study will recruit eligible employees at a large health management company to participate in a 6-month weight loss program and have weight measurements for an additional 3-month follow-up period. The primary outcome measure in this randomized controlled trial will be pounds of weight lost. The experimental groups will include variations of deposit contracts (participants put their own money at risk, and lose that money if they fail to achieve their weight loss goal) and fixed payments. The use of deposit contracts is a powerful mechanism for inducing behavior change that is based on loss aversion, a psychological concept first described by Nobel Prize winner Daniel Kahneman and Amos Tversky in 1979. A deposit contract takes advantage of the fact that people typically feel the pain of a loss more than the pleasure of a gain, increasing ones motivation to reach a goal.
The study hypotheses are 1) mean weight loss will be greater in all intervention groups compared to the control group by the end of 24 weeks; and 2) individuals in the intervention groups will have a lower mean weight at the end of the 3-month follow-up period than individuals in the control group.
|Condition or disease||Intervention/treatment||Phase|
|Weight Loss||Behavioral: Deposit contract with a 1:1 match Behavioral: Deposit contract with a 2:1 match Behavioral: Deposit Contract with no match||Not Applicable|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||132 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||None (Open Label)|
|Official Title:||University Of Pennsylvania Weight Loss Study|
|Actual Study Start Date :||May 24, 2011|
|Actual Primary Completion Date :||March 15, 2012|
|Actual Study Completion Date :||July 2016|
|No Intervention: 1|
Deposit contract with a 1:1 match
Behavioral: Deposit contract with a 1:1 match
Daily weigh-in for 24 weeks and if each daily goal met daily deposit amount is paid back with an additional matched amount equal to deposited amount. Final weigh-in at 36 weeks with no financial incentive or deposit made.
Deposit contract with a 2:1 match
Behavioral: Deposit contract with a 2:1 match
Daily weigh-in for 24 weeks and if each daily goal met daily deposit amount is paid back with an additional matched amount twice the amount equal to deposited amount. Final weigh-in at 36 weeks with no financial incentive or deposit made.
Experimental: Experimental 4
Deposit contract with no match
Behavioral: Deposit Contract with no match
Daily weigh-in for 24 weeks and if each daily goal met the daily deposit amount is paid back. Final weigh-in at 36 weeks with no financial incentive or deposit made.
- Change in Weight [ Time Frame: 24 Weeks ]Change in weight between baseline and 24 weeks
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01167634
|United States, Pennsylvania|
|University of Pennsylvania|
|Philadelphia, Pennsylvania, United States, 19104|
|Study Chair:||Kevin G. Volpp, MD, PhD||University of Pennsylvania|
|Study Director:||George Loewenstein, PhD||Carnegie Mellon University|
|Study Director:||Heather Schofield, MS||Harvard University|
|Principal Investigator:||Jeffrey T Kullgren, MD, MPH||University of Pennsylvania|