Cannabis Use
Conditions
Brief summary
This study aims to evaluate a mobile app designed to promote the safe use of cannabis among adult users in Quebec.
Interventions
OTHERJoint Effort
The Joint Effort intervention is available as an iPhone mobile application in French language. It aims to support cannabis users to take action upon their cannabis use.
The brief normative feedback is based on the frequency of cannabis use. Participants will also be offered basic reliable non-personalized information on lower-risk cannabis use in the form of official public websites.
Sponsors
Centre hospitalier de l'Université de Montréal (CHUM)
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Aged 18 years old or older * Be an active non-medical cannabis user (ie. self reported past month usage) * Understand, read and write French * Own a smartphone (iPhone)
Exclusion criteria
* None
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Protective Behavioral Strategies for Marijuana | Baseline, 2-weeks, 4-weeks | Adoption of Protective Behavioral Strategies; measured with the Protective Behavioral Strategies for Marijuana scale (PBSM-17). The French version of the questionnaire translated by Côté et al. (2021) will be used. The 17 items each represent a behavioral protection strategy. They are measured in terms of frequency of use on a six-point Likert-type scale (never, rarely, occasionally, sometimes, often and always). The total score of the PBSM-17 is obtained by calculating the total score of each item and then converting this raw score into a standardized form (T-score) ranging from 15 to 73. The lower the total score, the lesser the use of PBS. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Intention to take action | Baseline, 2-weeks, 4-weeks | Intention to take action on cannabis use is assessed via a three-item French-language questionnaire developed for this study, based on Ajzen's guidelines for measuring Theory of Planned Behavior. The questionnaire consist of 3 items: 1) "I intend to take action on my cannabis use in the coming month"; 2) "In the coming month, the chances that I will take action on my cannabis use are…"; and 3) "In the coming month, I will take action on my cannabis use." The items are rated on a seven-point Likert scale ranging, respectively, from "strongly disagree" to "strongly agree", "very low" to "very high", and "very unlikely" to "very likely". The score of intention to change is the sum of the 3 items (possible score range: 3 to 21). The lower the total score, the weaker the intention to take action on CU. |
| Cannabis use frequency | Baseline, 4-weeks | Cannabis use frequency is measured by a question adapted from the French version of the Canadian Community Health Survey (CCHS) : "How often did you use cannabis in the past month?". The answers follows a six-category rating scale: never; one day in the past month; 2-3 days in the past month; 1-2 days per week in the past month; 3-4 days per week in the past month; 5-6 days per week in the past month; and every day. |
| Severity of Dependence | Baseline | Level of dependence is measured with the Severity of Dependence Scale (french version). It consists of five items covering different psychological aspects of dependence: feeling of impaired control, anxiety, preoccupations, wish to stop, and compulsive use. The possible score ranges from 0 to 15. Items 1 to 4 are scored as follows: 0 = never/almost never, 1 = sometimes, 2 = often, and 3 = always/nearly always. Item 5 is scored as follows: 0 = not difficult, 1 = quite difficult, 2 = very difficult, and 3 = impossible. Previous studies have set empirically derived optimal cut-off scores for cannabis dependence at 2 to 4 or greater. |
Countries
Canada
Contacts
CONTACTJosé Côté, PhD
PRINCIPAL_INVESTIGATORDidier Jutras-Aswad
Université de Montréal
PRINCIPAL_INVESTIGATORSylvie Cossette
Université de Montréal
PRINCIPAL_INVESTIGATORChristine Genest
Université de Montréal
PRINCIPAL_INVESTIGATORShalini Lal
Université de Montréal
PRINCIPAL_INVESTIGATORJudith Lapierre
Laval University
PRINCIPAL_INVESTIGATORGabrielle Pagé
Université de Montréal
PRINCIPAL_INVESTIGATORJinghui Cheng
Polytechnique Montréal
Outcome results
None listed