The Impact of Group Commitment Contracts on Smoking Cessation and Weight Loss

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

SUSPENDED

Clinical Phase

NA

Total Enrollment

3600 participants

Study Classification

INTERVENTIONAL

Study Start Date

2023-12-18

Study Completion Date

2025-06-19

Brief Summary

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We will conduct a randomized controlled trial to evaluate the effectiveness of group commitment contracts for smoking cessation and weight loss.

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Detailed Description

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Initial screening will be conducted online via the Qualtrics survey platform. Respondents meeting the inclusion/exclusion criteria will immediately be randomized into one of the intervention arms described below, and then take a baseline survey. This baseline survey will also be conducted online via the Qualtrics survey platform. The initial screening, randomization, and baseline survey should take approximately 15 minutes total and can be completed anywhere the participant has an internet connection.

INTERVENTION: Respondents who meet the inclusion/exclusion criteria will be randomized into one of the following arms:

1. Control Arm (No Intervention)
2. Group Contract Arm
3. Individual Monetary Rewards Arm
4. Individual Commitment Contract Arm

Subjects in Arms #2-4 will be cross-randomized into two subgroups:

A. Additional information treatments on the likelihood of success of the different incentives and contracts, with the goal of shifting "naives" to "sophisticates."

B. No additional information treatments.

FOLLOW-UP SURVEY: After the participants finish their contract, they will be emailed a link to the follow-up survey that will be administered online via the Qualtrics survey platform. The survey should take approximately 5 minutes and can be completed anywhere the participant has an internet connection. Participants will be directly prompted to answer whether they have been able to quit smoking or lose their target weight in the past six months. If a participant self-reports a claim of smoking cessation or successful weight loss, they will be asked to furnish at-home verification of their claim.

IN-PERSON VERIFICATION: A randomly selected subset of successful participants will be asked for in-person verification of their claim with a urine test (smoking cessation) or in-person weigh-in (weight loss) at a Quest Diagnostics location of their choice.

Conditions

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Smoking Cessation Weight Loss

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Respondents who meet the inclusion/exclusion criteria will be randomized into one of the following arms:

1. Control Arm (No Intervention)
2. Group Contract Arm
3. Individual Monetary Rewards Arm
4. Individual Commitment Contract Arm

To understand the effect that knowledge about the effectiveness of commitment contracts has on uptake, smoking quit rates, and weight loss, we will be cross-randomizing those assigned to Arms #2-4 into further subgroups:

Subgroup A. In the initial survey, participants will receive additional information treatments on the likelihood of success of the different incentives and contracts, with the goal of shifting "naives" to "sophisticates." In other words, we aim to provide information that will encourage present-biased or loss-averse individuals to participate in the programs that offer the greatest chance at success.

Subgroup B. Participants will not receive any information about commitment contracts.

Primary Study Purpose

PREVENTION

Blinding Strategy

NONE

Study Groups

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Control

Individual Commitment Contract

Intervention Type BEHAVIORAL

Individuals will have the opportunity to create an individual commitment contract to quit smoking. They will have the option to set the stakes, start date, and (for weight loss contracts) target weight.

Interventions

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Group Commitment Contract

A group contract where the primary individual, who will be tracked by the study, can invite peers to join the contract and form their group. To initiate a contract, a user must choose: the stakes, start date, and (for weight loss contracts) target weight, and and, optionally, to allow other members to have the power to invite other people to join the group.

Intervention Type BEHAVIORAL

Individual Monetary Rewards

Individuals eligible for a $100 monetary reward (incentive) following verified smoking cessation or weight loss.

Intervention Type BEHAVIORAL

Individual Commitment Contract

Individuals will have the opportunity to create an individual commitment contract to quit smoking. They will have the option to set the stakes, start date, and (for weight loss contracts) target weight.

Intervention Type BEHAVIORAL

Information

In the initial survey, participants will receive additional information treatments on the likelihood of success of the different incentives and contracts, with the goal of shifting "naives" to "sophisticates."

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Aged 18 years or older
* Has smartphone with capability to reach internet daily and download app
* Able and willing to visit Quest location or take an at-home verification test
* Willing to furnish a payment method for commitment contract stakes

If completing a smoking cessation contract:

* Daily smoker

If completing a weight loss contract:

* Has access to a functioning scale
* Interest in losing weight at a pace of 2 lb or fewer per week, with a target BMI at or above 18.5