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Estimating Biased Beliefs in Cigarette Smoking Cessation
Last registered on June 17, 2017

Pre-Trial

Trial Information
General Information
Title
Estimating Biased Beliefs in Cigarette Smoking Cessation
RCT ID
AEARCTR-0002106
Initial registration date
March 22, 2017
Last updated
June 17, 2017 2:32 PM EDT
Location(s)
Region
Primary Investigator
Affiliation
LSE
Other Primary Investigator(s)
PI Affiliation
UCSF
Additional Trial Information
Status
Completed
Start date
2017-03-06
End date
2017-06-17
Secondary IDs
Abstract
We implement a field experiment to identify biased beliefs among cigarette smokers regarding the smoking cessation decision. Participants are offered incentives to refrain from smoking on a weekly basis. Smoking status is biochemically verified using cotinine saliva tests. Participants are asked also asked to predict their response to such incentives, as well as to value incentives for refraining from smoking on future dates.
External Link(s)
Registration Citation
Citation
Levy, Matthew and Justin White. 2017. "Estimating Biased Beliefs in Cigarette Smoking Cessation." AEA RCT Registry. June 17. https://doi.org/10.1257/rct.2106-2.0.
Former Citation
Levy, Matthew, Matthew Levy and Justin White. 2017. "Estimating Biased Beliefs in Cigarette Smoking Cessation." AEA RCT Registry. June 17. http://www.socialscienceregistry.org/trials/2106/history/18788.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
Subjects receive financial incentives to refrain from smoking on a weekly basis.
Intervention Start Date
2017-03-27
Intervention End Date
2017-06-17
Primary Outcomes
Primary Outcomes (end points)
Key variables include:
- Weekly self-reported smoking behaviour
- Biometric verification (saliva cotinine test) of smoking status
- Valuations of future smoking incentives
- Unincentivized predictions of future smoking behaviour
- Completion of effort task, valuations and unincentivized predictions
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Subjects are recruited through an online panel partner. In Month 1 and Month 2 surveys, subjects value Month-3 incentives for abstinence. A treated group receives further incentives to refrain from smoking during Month 2.
Experimental Design Details
See additional materials
Randomization Method
Stratified randomization, based on: MSA, smoking status (intensity, dual use), quit intentions, income.
Randomization Unit
Individual.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
Up to 900 individuals were initially planned for recruitment. Based on the capability of the sample provider, this was reduced to n=463 initial qualified.
Sample size: planned number of observations
Up to 900 individuals.
Sample size (or number of clusters) by treatment arms
Treatment (month 2) to be assigned on a 2:1 ratio. For N=397, 132 control and 265 treated.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
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Supporting Documents and Materials

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IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
University of Illinois at Chicago, Office for the Protection of Research Subjects Institutional Review Board
IRB Approval Date
2017-03-07
IRB Approval Number
2013-0844
Analysis Plan

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Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is data collection complete?
Data Publication
Data Publication
Is public data available?
No
Program Files
Program Files
Reports, Papers & Other Materials
Relevant Paper(s)
REPORTS & OTHER MATERIALS