Contingency Management to Promote Weight Loss in Low Income Adults

Study Overview
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Brief Summary
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This study is designed to evaluate the feasibility and provide preliminary evidence for efficacy of a 12-week contingency management intervention to promote weight loss in overweight and obese low income adults in a community-based clinic. The study has three primary goals: (a) to determine if the contingency management treatment can be effectively applied to a new application, weight loss; (b) to obtain preliminary evidence for contingency management's efficacy in promoting weight loss and improving treatment retention, diet quality, physical activity levels, and self efficacy; and (c) to identify barriers and challenges to implementing contingency management for weight loss among low income patients.

Official Title
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Contingency Management to Promote Weight Loss in Low Income Adults

Conditions
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Overweight

Intervention / Treatment
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* Behavioral: contingency management
* Behavioral: weight loss manual-guided individual therapy sessions


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: age between 18 and 55 years body mass index in kg/m2 (BMI) between 25 and 39.9 resting blood pressure between 90/60 and 140/90 ability to speak English and read at the 6th grade level willingness to be randomly assigned to one of two groups Exclusion Criteria: any serious acute or chronic medical problems that may impact dietary or exercise regimens psychiatric conditions

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: A<br>Participants assigned to Group A will receive the DPP manual (Wing & Gillis, 1996), a behavioral weight-loss program with demonstrated efficacy in facilitating weight loss. Participants in Group A will be instructed to read a section of the manual each week and complete suggested activities. They will also meet with the research staff once a week for weigh-in and supportive counseling. | Behavioral: weight loss manual-guided individual therapy sessions<br>* once weekly counseling session with research staff<br>|
| Experimental: B<br>Participants assigned to Group B will receive the DPP manual and will meet with research staff each week for weigh-in and supportive counseling. They will also receive contingency management or the opportunity to earn draws with the chance of winning prizes for losing weight and completing healthy activities. | Behavioral: contingency management<br>* Prize-based contingency management for weight loss<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| absolute and relative weight loss |  | pre-treatment, weekly during active phase, post-treatment | 
| number of participants achieving clinically significant weight loss (5% or more of baseline weight) |  | pre-treatment, weekly during active phase, post-treatment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| retention |  | during active phase | 
| changes on measures of diet quality, physical activity, and self-efficacy |  | pre-treatment, post-treatment | 
| self-reports, focus groups |  | pre-treatment, post-treatment | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Overweight, Obesity, Contingency Management