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Trial registered on ANZCTR


Registration number
ACTRN12616000879460
Ethics application status
Approved
Date submitted
28/06/2016
Date registered
5/07/2016
Date last updated
25/05/2018
Type of registration
Prospectively registered

Titles & IDs
Public title
Making the most of plain packaging: using self-efficacy messages printed on cigarette packaging to help smokers to quit.
Scientific title
Making the most of plain packaging: using self-efficacy messages on cigarette packaging to promote smoking cessation.
Secondary ID [1] 289557 0
nil
Universal Trial Number (UTN)
U1111-1184-7314
Trial acronym
MMOPP
Linked study record

Health condition
Health condition(s) or problem(s) studied:
tobacco use 299280 0
Condition category
Condition code
Public Health 299277 299277 0 0
Other public health
Mental Health 299295 299295 0 0
Addiction

Intervention/exposure
Study type
Interventional
Description of intervention(s) / exposure
This study will recruit a community sample of smokers for a three week trial assessing the effect of adding self-efficacy messages to the graphic warning images displayed on tobacco packaging. The trial consists of a baseline phase of one week, during which all participants smoke from packaging displaying the current government mandated health warning labels (HWLs), and a two week experimental phase wherein participants will be randomly assigned to a control or an experimental group and will be exposed to different HWLs accordingly. All participants will be required to stick an adhesive label over the warning label on the packaging of their tobacco (which they have purchased as usual) at the time of first opening. Those in the control group will have labels identical to the standard HWLs currently in circulation. Those in the experimental group will have labels with the same graphic images, but will have a study-specific self-efficacy message in place of the usual text warning. All participants will be required to carry a hand-held computer with them at all times for the duration of the study and will complete frequent assessments recording their smoking- related cognitions and behaviours as well as take photographs of their tobacco packaging with study-specific HWLs in place in order to monitor compliance. . Participants will also visit a laboratory at the University of Tasmania three times during the course of the trial and provide samples of exhaled air to verify their self-reported smoking behaviour by measuring carbon monoxide levels. These visits would be scheduled at the beginning of the baseline phase, at the conclusion of the baseline phase and at the end of the experimental phase. Efficacy message labels will target response efficacy, self-efficacy and control perceptions and will feature an alternative warning statement (the large, bold text above the graphic image) and and alternative explanatory message (the smaller, more detailed text below the image on the back of the package). Efficacy messages will vary according to the nature of the graphic image with which they are combined. For example, a warning statement combined with and image of a damaged heart might say "DON’T SMOKE THIS ONE AND UNCLOG YOUR ARTERIES.Use nicotine patches and gums in combination to beat cravings" and feature an explanatory message such as: "If you quit smoking now, your risk of coronary heart disease will drop by half in a years’ time. It’s not too late. You can talk to your GP to get nicotine patches to overcome your cravings. Quitting at any age is well worth the effort".
Intervention code [1] 295149 0
Lifestyle
Intervention code [2] 295169 0
Treatment: Other
Intervention code [3] 295172 0
Behaviour
Comparator / control treatment
Half of the participants will be assigned to a control group. During the baseline phase, the control group will smoke their tobacco as usual from original packaging with standard government mandated health warning labels. During the experimental phase of the study, the control group will be issued with sets of adhesive health warning labels identical to those required by law to be printed on tobacco packaging and will be required to stick these over the original health warning labels. This will control for the possibility of extraneous effects in the experimental group associated with the attentional processes involved in sticking warning labels to the tobacco packaging.
Control group
Active

Outcomes
Primary outcome [1] 298761 0
level of intention to quit smoking as assessed using two questions with numerical rating scales on the hand-held computer device and also via questionnaires with numerical rating scales at lab visits. The questions comprising these scales have been used in previous studies which have investigated intention to quit (e.g. Orbell, et al. (2009). Social–cognitive beliefs, alcohol, and tobacco use: A prospective community study of change following a ban on smoking in public places. Health Psychology, 28(6), 753.; Schuez, et al.. (2016). Immediate effects of plain packaging health warnings on quitting intention and potential mediators: Results from two ecological momentary assessment studies. Psychology of Addictive Behaviors, 30(2), 220.)
Timepoint [1] 298761 0
1. Daily:both after exposure to warning labels (each time a participant logs a cigarette); in response to random prompts from the device (which occur 4-5 times each day); when completing a scheduled evening report.
2. At lab visits: at the end of the baseline (day 7) and experimental (day 21) phases.
Primary outcome [2] 298762 0
Proportion of participants with a reduction in the number of cigarettes smoked daily as assessed by the number of cigarettes logged on the hand-held computer and on questionnaires at lab visits. The reported number of cigarettes participants smoke daily will be verified by measuring the carbon monoxide levels in exhaled air. This method of measuring smoking behaviour has been validated previously and shown to be associated with high levels of participant compliance ( Schuez, et al.. (2014). Compliance with an EMA monitoring protocol and its relationship with participant and smoking characteristics. nicotine & tobacco research, 16(Suppl 2), S88-S92.)
Timepoint [2] 298762 0
1. Daily: recorded on hand held devices.
2. Lab visits: at the end of the baseline phase (day 7) and at the end of the experimental phase (day 21).
Primary outcome [3] 298763 0
level of risk perception as assessed with numerical rating scales on hand held devices and on questionnaires at lab visits. The questions comprising these scales have been used previously to assess risk perception (e.g. Orbell, et al. (2009). Social–cognitive beliefs, alcohol, and tobacco use: A prospective community study of change following a ban on smoking in public places. Health Psychology, 28(6), 753; Schuez, N., & Ferguson, S. G. (2015). Australian smokers’ and nonsmokers’exposure to anti-smoking warnings in day-to-day life: A pilot study. Nicotine & Tobacco Research, 17, 876 – 881)
Timepoint [3] 298763 0
1. daily: after exposure to warning labels (each time participants log a cigarette).
2. lab visits: at the end of the baseline phase (day 7) and the end of the experimental phase (day 21).
Secondary outcome [1] 325194 0
none
Timepoint [1] 325194 0
none

Eligibility
Key inclusion criteria
Current smokers from the greater Hobart area, who have smoked a minimum of ten cigarettes daily for the past three years. They must have an adequate grasp of the English language and not be interested in quitting in the next month
Minimum age
18 Years
Maximum age
No limit
Sex
Both males and females
Can healthy volunteers participate?
No
Key exclusion criteria
Pregnancy, cognitive impairment, intellectual disability, mental illness.

Study design
Purpose of the study
Treatment
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
central randomisation
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
computerised sequence generation
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?



Intervention assignment
Parallel
Other design features
Phase
Not Applicable
Type of endpoint/s
Efficacy
Statistical methods / analysis
The proposed sample size (n=60; 30 participants per group) was determined by the requirements of the primary research questions – namely, detecting differences in intention quitting behaviours and risk perception scores between the modified warning label and the control group at the end of the treatment period. Estimates of the expected effect sizes are based on two systematic reviews examining the combination of fear appeals and self-efficacy. Pooling these effect sizes in a random-effects meta-analytic model yields a combined effect size of d = .76. In order to detect an effect of this size with a power of .8 and an alpha of .05, 58 participants are needed. Moreover, Montecarlo simulation studies suggest that 60 participants with the intended number of assessments are sufficient for random effects analyses (assessments [level-1] nested in participants [level-2]) yielding unbiased standard errors and variance components.

Multilevel (linear mixed effect) models will be used to analyse the experimental data and the moderated mediational pathways of the intervention. These analyses allow for an unequal number of observations across individuals. Thus, we will be able to use all available data and do not need to exclude data based on level of completeness. We will run latent growth curve models to test for within-person changes in intention and the suggested mediators across the baseline and experimental phases. We will test for differences in slopes between the experimental groups (according to the hypotheses, the slopes for intention and its predictors should not be different from zero in the control group, whereas the slopes will be higher in the experimental group).
We will compare participants’ quit intentions and their mediators after encountering a warning to intentions and mediators at random times of the day. For this, we will run a multilevel moderated mediation model with intention to quit as dependent variable, type of assessment (immediately post-cigarette vs. random prompt) as the independent variable, and defensive reactions as moderator, risk appraisal and self-efficacy as mediators. The experimental group will be treated as moderator to model differential intervention effects. Overall self-efficacy ratings and nicotine dependence/number of cigarettes per day will be tested as moderators of the effects of the intervention on threat management resources and intentions and the effects of intentions on smoking.

Recruitment
Recruitment status
Completed
Date of first participant enrolment
Anticipated
6/07/2016
Actual
27/02/2017
Date of last participant enrolment
Anticipated
1/10/2017
Actual
29/11/2017
Date of last data collection
Anticipated
22/10/2017
Actual
20/12/2017
Sample size
Target
60
Accrual to date
Final
77
Recruitment in Australia
Recruitment state(s)
TAS

Funding & Sponsors
Funding source category [1] 293928 0
University
Name [1] 293928 0
University of Tasmania
Country [1] 293928 0
Australia
Primary sponsor type
Individual
Name
Dr. Natalie Schuez
Address
University of Tasmania
School of Health Sciences
Private Bag 135
Hobart, TAS. 7000
Country
Australia
Secondary sponsor category [1] 292756 0
Individual
Name [1] 292756 0
Dr. Benjamin Schuez
Address [1] 292756 0
University of Tasmania
Psychology, School of Medicine, Faculty of Health.
Private Bag 30.
Hobart, TAS, 7001
Country [1] 292756 0
Australia
Secondary sponsor category [2] 292757 0
Individual
Name [2] 292757 0
Dr. Stuart Ferguson
Address [2] 292757 0
University of Tasmania
Pharmacy, School of Medicine, Faculty of Health
Private Bag 34, Hobart TAS 7001
Country [2] 292757 0
Australia
Secondary sponsor category [3] 292758 0
Individual
Name [3] 292758 0
Lillian Brinken
Address [3] 292758 0
University of Tasmania
Psychology, School of Medicine, Faculty of Health.
Private Bag 30.
Hobart, TAS, 7001
Country [3] 292758 0
Australia

Ethics approval
Ethics application status
Approved
Ethics committee name [1] 295350 0
Tasmanian Health and Medical Human Research Ethics Committee
Ethics committee address [1] 295350 0
Ethics committee country [1] 295350 0
Australia
Date submitted for ethics approval [1] 295350 0
18/04/2016
Approval date [1] 295350 0
15/06/2016
Ethics approval number [1] 295350 0
H0015696

Summary
Brief summary
Trial website
Trial related presentations / publications
Public notes

Contacts
Principal investigator
Name 66962 0
Dr Natalie Schuez
Address 66962 0
University of Tasmania
School of Health Sciences
Private Bag 135
Hobart TAS 7000
Country 66962 0
Australia
Phone 66962 0
+61 3 62264606
Fax 66962 0
Email 66962 0
natalie.schuez@utas.edu.au
Contact person for public queries
Name 66963 0
Benjamin Schuez
Address 66963 0
University of Tasmania.
Psychology, School of Medicine, Faculty of Health
Private Bag 30,
Hobart TAS 7001
Country 66963 0
Australia
Phone 66963 0
+61 3 6226 7471
Fax 66963 0
Email 66963 0
benjamin.schuez@utas.edu.au
Contact person for scientific queries
Name 66964 0
Benjamin Schuez
Address 66964 0
University of Tasmania.
Psychology, School of Medicine, Faculty of Health
Private Bag 30,
Hobart TAS 7001
Country 66964 0
Australia
Phone 66964 0
+61 3 6226 7471
Fax 66964 0
Email 66964 0
benjamin.schuez@utas.edu.au

No information has been provided regarding IPD availability


What supporting documents are/will be available?

No Supporting Document Provided



Results publications and other study-related documents

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