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Using Group Commitment for Smoking Cessation

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.
 
ClinicalTrials.gov Identifier: NCT01311115
Recruitment Status : Completed
First Posted : March 9, 2011
Results First Posted : September 15, 2022
Last Update Posted : September 15, 2022
Sponsor:
Collaborators:
National Institute on Aging (NIA)
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
Srinakharinwirot University
Information provided by (Responsible Party):
William Dow, University of California, Berkeley

Study Type Interventional
Study Design Allocation: Randomized;   Intervention Model: Parallel Assignment;   Masking: Single (Outcomes Assessor);   Primary Purpose: Treatment
Condition Smoking
Interventions Behavioral: Group commitment contract
Behavioral: Smoking cessation education and counseling
Enrollment 201
Recruitment Details  
Pre-assignment Details  
Arm/Group Title Group Commitment Contracts Education and Counseling
Hide Arm/Group Description

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

Period Title: Overall Study
Started 132 69
Completed 132 69
Not Completed 0 0
Arm/Group Title Group Commitment Contracts Education and Counseling Total
Hide Arm/Group Description

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

Total of all reporting groups
Overall Number of Baseline Participants 132 69 201
Hide Baseline Analysis Population Description
[Not Specified]
Age, Continuous  
Mean (Standard Deviation)
Unit of measure:  Years
Number Analyzed 132 participants 69 participants 201 participants
51.05  (13.82) 51.07  (14.04) 51.06  (13.86)
Sex: Female, Male  
Measure Type: Count of Participants
Unit of measure:  Participants
Number Analyzed 132 participants 69 participants 201 participants
Female
16
  12.1%
9
  13.0%
25
  12.4%
Male
116
  87.9%
60
  87.0%
176
  87.6%
Race and Ethnicity Not Collected   [1] 
Measure Type: Count of Participants
Unit of measure:  Participants
Number Analyzed 0 participants 0 participants 0 participants
0
[1]
Measure Analysis Population Description: Race and Ethnicity were not collected from any participant.
Region of Enrollment  
Measure Type: Number
Unit of measure:  Participants
Thailand Number Analyzed 132 participants 69 participants 201 participants
132 69 201
Religion   [1] 
Measure Type: Count of Participants
Unit of measure:  Participants
Number Analyzed 131 participants 69 participants 200 participants
Buddhist
91
  69.5%
48
  69.6%
139
  69.5%
Muslim
40
  30.5%
21
  30.4%
61
  30.5%
[1]
Measure Analysis Population Description: Missing baseline data
Education (years)   [1] 
Measure Type: Count of Participants
Unit of measure:  Participants
Number Analyzed 131 participants 69 participants 200 participants
0-3 years
62
  47.3%
34
  49.3%
96
  48.0%
4-6 years
29
  22.1%
22
  31.9%
51
  25.5%
7 or more years
40
  30.5%
13
  18.8%
53
  26.5%
[1]
Measure Analysis Population Description: Missing baseline data
Monthly household income   [1] 
Mean (Standard Deviation)
Unit of measure:  USD, in 100s
Number Analyzed 131 participants 69 participants 200 participants
4.011  (5.805) 3.513  (2.809) 3.838  (4.971)
[1]
Measure Analysis Population Description: Missing baseline data
1.Primary Outcome
Title Smoking Status at 6 Months
Hide Description 7-day point prevalence of smoking abstinence measured 6 months after enrollment, using a NicCheck urine cotinine test. Participants who self-report having smoked in the last 7 days, as part of the follow-up survey, are considered to be continuing smokers.
Time Frame 6 months after enrollment
Hide Outcome Measure Data
Hide Analysis Population Description
[Not Specified]
Arm/Group Title Group Commitment Contracts Education and Counseling
Hide Arm/Group Description:

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

Overall Number of Participants Analyzed 128 68
Measure Type: Count of Participants
Unit of Measure: Participants
57
  44.5%
13
  19.1%
2.Secondary Outcome
Title Concordance of Smoking Status Between Partners at 6 Months
Hide Description The concordance of smoking status among randomly assigned pairs: both abstain, both smoke, or one abstains and one smokes, measured using 7-day point-prevalence abstinence at 6 months after enrollment, measured using self-reported abstinence and urine cotinine testing. Participants in the control condition are assigned to a pair, but their partner's identity is never revealed during the study.
Time Frame 6 months after enrollment
Hide Outcome Measure Data
Hide Analysis Population Description
In the education and counseling group, this represents a partner who is randomly assigned to the person but whose identity is never revealed.
Arm/Group Title Group Commitment Contracts Education and Counseling
Hide Arm/Group Description:

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

Overall Number of Participants Analyzed 127 55
Measure Type: Count of Participants
Unit of Measure: Participants
Both abstain
31
  24.4%
2
   3.6%
Both smoke
45
  35.4%
36
  65.5%
One abstains, one smokes
51
  40.2%
17
  30.9%
3.Secondary Outcome
Title Smoking Status at 3 Months
Hide Description 7-day point prevalence of smoking abstinence measured 3 months after enrollment, using a NicCheck urine cotinine test. Participants who self-report having smoked in the last 7 days, as part of the follow-up survey, are considered to be continuing smokers.
Time Frame 3 months after enrollment
Hide Outcome Measure Data
Hide Analysis Population Description
[Not Specified]
Arm/Group Title Group Commitment Contracts Education and Counseling
Hide Arm/Group Description:

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

Overall Number of Participants Analyzed 128 68
Measure Type: Count of Participants
Unit of Measure: Participants
60
  46.9%
10
  14.7%
4.Secondary Outcome
Title Concordance of Smoking Status Between Partners at 3 Months
Hide Description The concordance of smoking status among randomly assigned pairs: both abstain, both smoke, or one abstains and one smokes, measured using 7-day point-prevalence abstinence at 3 months after enrollment, measured using self-reported abstinence and urine cotinine testing. Participants in the control condition are assigned to a pair, but their partner's identity is never revealed during the study.
Time Frame 3 months after enrollment
Hide Outcome Measure Data
Hide Analysis Population Description
[Not Specified]
Arm/Group Title Group Commitment Contracts Education and Counseling
Hide Arm/Group Description:

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

Overall Number of Participants Analyzed 128 55
Measure Type: Count of Participants
Unit of Measure: Participants
Both abstain
35
  27.3%
0
   0.0%
Both smoke
44
  34.4%
40
  72.7%
One abstains, one smokes
49
  38.3%
15
  27.3%
5.Secondary Outcome
Title Smoking Status at 14 Months
Hide Description 7-day point prevalence of smoking abstinence measured 6 months after enrollment, using a NicCheck urine cotinine test. Participants who self-report having smoked in the last 7 days, as part of the follow-up survey, are considered to be continuing smokers.
Time Frame 14 months after enrollment
Hide Outcome Measure Data
Hide Analysis Population Description
[Not Specified]
Arm/Group Title Group Commitment Contracts Education and Counseling
Hide Arm/Group Description:

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

Overall Number of Participants Analyzed 128 68
Measure Type: Count of Participants
Unit of Measure: Participants
53
  41.4%
17
  25.0%
Time Frame [Not Specified]
Adverse Event Reporting Description [Not Specified]
 
Arm/Group Title Group Commitment Contracts Education and Counseling
Hide Arm/Group Description

The intervention includes the following components:

  1. Education and counseling (same as control group): 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.
  2. 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.
  3. 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.
  4. Each participant is paired with another study participant at enrollment. 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.

Participants in this group receive educational pamphlets about quitting smoking and one-time, group counseling from a nurse trained in smoking cessation counseling.

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.

All-Cause Mortality
Group Commitment Contracts Education and Counseling
Affected / at Risk (%) Affected / at Risk (%)
Total   1/132 (0.76%)   0/69 (0.00%) 
Hide Serious Adverse Events
Group Commitment Contracts Education and Counseling
Affected / at Risk (%) Affected / at Risk (%)
Total   0/132 (0.00%)   0/69 (0.00%) 
Hide Other (Not Including Serious) Adverse Events
Frequency Threshold for Reporting Other Adverse Events 0%
Group Commitment Contracts Education and Counseling
Affected / at Risk (%) Affected / at Risk (%)
Total   0/132 (0.00%)   0/69 (0.00%) 
Certain Agreements
Principal Investigators are NOT employed by the organization sponsoring the study.
There is NOT an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.
Results Point of Contact
Layout table for Results Point of Contact information
Name/Title: Justin White
Organization: University of California, San Francisco
Phone: 415-476-8045
EMail: Justin.White@ucsf.edu
Layout table for additonal information
Responsible Party: William Dow, University of California, Berkeley
ClinicalTrials.gov Identifier: NCT01311115    
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
Results First Submitted: August 23, 2022
Results First Posted: September 15, 2022
Last Update Posted: September 15, 2022