The Impact of Group Commitment Contracts on Smoking Cessation and Weight Loss
Public ClinicalTrials.gov record NCT04224727. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
We will conduct a randomized controlled trial to evaluate the effectiveness of group commitment contracts for smoking cessation and weight loss.
Study identification
- NCT ID
- NCT04224727
- Recruitment status
- Suspended
- Study type
- Interventional
- Phase
- Not applicable
- Enrollment
- 3,600 participants
Conditions and interventions
Conditions
Interventions
- Group Commitment Contract Behavioral
- Individual Monetary Rewards Behavioral
- Individual Commitment Contract Behavioral
- Information Other
Behavioral · Other
Eligibility (public fields only)
- Age range
- 18 Years and older
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Dec 17, 2023
- Primary completion
- Jun 18, 2025
- Completion
- Jun 18, 2025
- Last update posted
- Apr 15, 2024
2023 – 2025
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Northwestern University, Global Poverty Research Lab | Evanston | Illinois | 60208 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04224727, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Apr 15, 2024 · Synced Sep 2, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04224727 live on ClinicalTrials.gov.