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

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Conditions studied: Smoking Cessation, Weight Loss

In brief

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

Key facts

Study ID

NCT04224727

Run by

National Bureau of Economic Research, Inc.

People needed

3600

Starts

2023-12-18

Expected to finish

2025-06-19

Last updated by the study team

2024-04-16

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• 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

You may not qualify if…

• Pregnancy
• Any terminal illness

Where it is running

• Northwestern University, Global Poverty Research Lab — Evanston, Illinois, United States

Full record on ClinicalTrials.gov

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