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Using Group Commitment for Smoking Cessation

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified February 2011 by University of California, Berkeley.
Recruitment status was:  Recruiting
Sponsor:
ClinicalTrials.gov Identifier:
NCT01311115
First Posted: March 9, 2011
Last Update Posted: March 9, 2011
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Collaborators:
National Institute on Aging (NIA)
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
Srinakharinwirot University
Information provided by:
University of California, Berkeley
  Purpose

This study proposes a novel behavioral intervention to help smokers in Thailand to achieve their goals of quitting. Smoking treatment programs are rare throughout most of Asia and unlikely to meet the impending demand for quitting that tobacco control regulations is stimulating. New approaches are needed.

The present study is a randomized controlled trial to test the effectiveness of a novel, scalable approach to smoking cessation that is targeted toward rural Southeast Asian communities. Thailand is used as a test case to explore if pairs of smokers quit successfully after making financially-backed commitments and receiving cash incentives to quit. The control group receives education and counseling about quitting. In addition to education and counseling about quitting, the intervention includes two key components:

  1. Each participant is encouraged to deposit his "cigarette money" on a weekly basis, to be returned only if the smoker quits successfully within three months. Such commitment contracts, based on theory from behavioral economics, are designed to help a person to maintain self-control and motivation in the face of temptation.
  2. Each participant is paired with another study participant. If both quit, each receives a cash bonus. The joint incentives are designed to lead partners to support each other throughout the quit attempt.

Thus, group commitment contracts marshal a robust blend of elements: financial commitment, social support, peer pressure, and monetary rewards. A larger, follow-up evaluation will clarify the relative importance of each of these elements.


Condition Intervention
Smoking Behavioral: Group commitment contract Behavioral: Smoking cessation education and counseling

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Using Group Commitment for Smoking Cessation

Resource links provided by NLM:


Further study details as provided by University of California, Berkeley:

Primary Outcome Measures:
  • Smoking status at 6 months [ Time Frame: 6 months after enrollment ]
    Smoking status, measured 6 months after enrollment, is determined using a NicCheck (TM) urine cotinine test.


Secondary Outcome Measures:
  • Concordance of smoking status between partners at 6 months [ Time Frame: 6 months after enrollment ]
    Participants in the treatment condition will be assigned a partner. The concordance of smoking status among pairs--both quit, both smoke, or one quits and one smokes--will be measured using the NicCheck (TM) urine cotinine test.

  • Smoking status at 3 months [ Time Frame: 3 months after enrollment ]
    Smoking status, measured 3 months after enrollment, is determined using a NicCheck (TM) urine cotinine test.

  • Concordance of smoking status between partners at 3 months [ Time Frame: 3 months after enrollment ]
    Participants in the treatment condition will be assigned a partner. The concordance of smoking status among pairs--both quit, both smoke, or one quits and one smokes--will be measured using the NicCheck (TM) urine cotinine test.


Estimated Enrollment: 200
Study Start Date: November 2010
Estimated Study Completion Date: August 2011
Estimated Primary Completion Date: February 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Group commitment contracts

In addition to education and counseling, the intervention includes the following components:

  1. Each participant is encouraged to deposit his "cigarette money" on a weekly basis, to be returned only if the smoker quits successfully within three months.
  2. The project gives a series of two matching contributions of 150 baht each to participants who meet certain deposit requirements.
  3. Each participant is paired with another study participant. If both quit, each receives a cash bonus of 1,200 baht. At enrollment, pairs receive brief counseling on ways to support each other during the quit attempt.
Behavioral: Group commitment contract
  1. Each participant is required to deposit at least 50 baht at enrollment. A deposit collector visits each participant on a weekly basis and collects additional deposits on a voluntary basis. All deposits are returned only if the smoker quits successfully within three months.
  2. The project gives a matching contribution of 150 baht for the initial deposit of at least 50 baht. All participants in the treatment group are further randomized to a one-month group and a three-month group. The one-month group receives an additional 150 baht of project funds if they deposit 100 baht of their money within one month of enrollment. The three-month group receives 150 baht for depositing 100 baht within three months of enrollment.
  3. Each participant is paired with another study participant. If both quit, each receives a cash bonus of 1,200 baht. At enrollment, pairs receive brief counseling on ways to support each other during the quit attempt.
Other Names:
  • Commitment contract
  • Deposit contract
  • Contingency contract
  • Buddy intervention
  • Partner intervention
Behavioral: Smoking cessation education and counseling
Participants receive educational pamphlets on reasons to quit smoking and strategies for quitting smoking. They also receive one-time, group counseling on quitting smoking from a nurse trained in smoking cessation counseling.
Other Name: Smoking cessation counseling
Active Comparator: Education and counseling
Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.
Behavioral: Smoking cessation education and counseling
Participants receive educational pamphlets on reasons to quit smoking and strategies for quitting smoking. They also receive one-time, group counseling on quitting smoking from a nurse trained in smoking cessation counseling.
Other Name: Smoking cessation counseling

  Eligibility

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


Ages Eligible for Study:   20 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Current smoker of at least 10 cigarettes per week and at least 100 cigarettes over the course of a lifetime
  • Residents of the study area in Nakhon Nayok province, which includes the six subdistricts of Klong Yai, Chumpon, Bueng San, Pak Phli, Khao Phoem, or Ongkharak

Exclusion Criteria:

  • Pregnant
  • Plans to leave the study area within the next 12 months
  Contacts and Locations
Information from the National Library of Medicine

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): NCT01311115


Contacts
Contact: Justin S White, MA, MSPH 617-510-9952 jswhite@berkeley.edu
Contact: William Dow, PhD wdow@berkeley.edu

Locations
Thailand
Srinakharinwirot University Recruiting
Ongkharak, Nakhon Nayok, Thailand, 26120
Contact: Justin S White, MA MSPH    617-510-9952    jswhite@berkeley.edu   
Sub-Investigator: Justin S White, MA MSPH         
Principal Investigator: Suthat Rungruanghiranya, MD         
Sponsors and Collaborators
University of California, Berkeley
National Institute on Aging (NIA)
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
Srinakharinwirot University
Investigators
Study Director: Justin S White, MSPH MA University of California at Berkeley
Principal Investigator: William H Dow, PhD University of California at Berkeley
Principal Investigator: Suthat Rungruanghiranya, MD Srinakharinwirot University
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Justin White, University of California at Berkeley
ClinicalTrials.gov Identifier: NCT01311115     History of Changes
Other Study ID Numbers: 2010-04-1269
2P30AG012839-16 ( U.S. NIH Grant/Contract )
R21HD056581 ( U.S. NIH Grant/Contract )
First Submitted: March 8, 2011
First Posted: March 9, 2011
Last Update Posted: March 9, 2011
Last Verified: February 2011