Joint Effort 2.0: a Mobile Application With University Students

Study Overview
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Brief Summary
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The purpose of this study is to evaluate quantitatively and qualitatively a mobile application, Joint Effort, targeting safe cannabis use among consumers. This randomized controlled trial is currently conducted on the Joint Effort mobile application.

Detailed Description
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This online randomized controlled trial with parallel groups is conducted in Quebec (Canada). Interested participants are invited to visit the study's website at www.etudejointeeffort.ca The study's Website contains text explaining the study. After accepting the conditions and consenting, participants will enroll in the study by providing an email address and a pseudonym. Each participant will be validated through an email address check. After their enrolment, participants will receive a hyperlink via email to invite them to complete a baseline questionnaire. After completing the baseline questionnaire, participants will be randomly assigned by the computer system either to an experimental group (Joint Effort mobile application) or to a control group (brief normative feedback and standard information). Four weeks and eight weeks after the baseline questionnaire, participants will complete the online questionnaires again.

Official Title
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Joint Effort, a Mobile Prevention and Harm Reduction Application

Conditions
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Cannabis Use, Cannabis, Cannabis Dependence, Cannabis Smoking, Cannabis Use, Unspecified

Intervention / Treatment
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* Other: Joint Effort
* Other: Brief normative feedback and standard information


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Aged between 18-35 years old Be a non-medical cannabis user and have used in the last month Understand, read and write French Own a smartphone (iPhone) Exclusion Criteria: None

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 35 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Joint Effort mobile application<br>The Joint Effort mobile application aims to support young adults in taking action on their cannabis use. Based on the Theory of Planned Behaviour, the content focuses on intention, attitude, and perceived behavioral control. Various intervention methods and strategies are used to address these determinants (e.g., personalized feedback, persuasive communication, self-observation, and activation of intention). The objectives include: to allow the individual to become aware (or more aware) of their cannabis use, to support the individual's decision-making process of taking action on their cannabis use, and to guide and support the establishment and sustainability of an action plan. An optional logbook-type feature (weekly journal of cannabis use) allows personalized monitoring and data collection throughout the course of the intervention. | Other: Joint Effort<br>* The Joint Effort intervention is available in the form of an iPhone mobile application (running on iOS 13 and higher) in French language. It aims to support young adults in school who have used cannabis in the past month into taking action on their cannabis use.<br>|
| Active Comparator: Brief normative feedback and standard information<br>The comparator is composed of a brief normative feedback regarding last month's frequency of cannabis use and basic reliable non-personalized information on lower-risk cannabis use (official public websites). | Other: Brief normative feedback and standard information<br>* 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.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Protective Behavioral Strategies for Marijuana (PBSM-17) used | The French version of the questionnaire translated by Côté et al. (2021) will be used. The 17 items proposed in the scale, each representing a behavioral protection strategy, are measured in terms of frequency of use on a six-point Likert-type scale (never, rarely, occasionally, sometimes, often and always). As indicated by its developers, 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. | 8 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in intention to take action on cannabis use | Intention is assessed by three items with a 7 points Likert Scale as recommended by Ajzen (2013): 1) I intend to take action on my cannabis use within the next month will be rated on a scale from 1 = strongly disagree to 7 = strongly agree; 2) Over the next month, the chances of me taking action on my cannabis use are … will be rated on a scale from 1=very low to 7=very high; 3) Over the next month, I will be taking action on my cannabis use will be rated on a scale from 1=very unlikely to 7=very likely. Intention items scores are tallied for an overall score (range of 3-21). | 8 weeks | 
| Cannabis use frequency | The frequency of cannabis use will be assessed using a question previously used in the Quebec (Canada) Survey on Cannabis (2022). | 8 weeks | 
| Severity of Dependence | Measured with the Severity of Dependence Scale (SDS) scale (Martin et al., 2006) which includes five items related to compulsive behaviors, concerns, anxiety, and feelings of loss of control in the context of cannabis use. Four of the items are scored on a Likert-type scale ranging from never/almost never (1) to always (4) and one item offers a scale ranging from not difficult (1) to impossible (4). Severity of dependance items scores are tallied for an overall score (range of 5-20). | 8 weeks | 
| Subjective engagement with the developed mobile application (acceptability) | Subjective engagement (self-reported) will be measured using the validated French version (Fontaine et al., 2020) of the User Engagement Scale - Short Form (UES-SF) (O'Brien et al., 2018). This 12-item instrument serves to measure four dimensions of engagement: 1) aesthetic appeal; 2) focused attention; 3) perceived usability, and 4) reward factor. Possible answers range from strongly disagree (+1) to strongly agree (+5). The possible total score ranges between 12 and 60. The score for each item will be interpreted and the scores for each dimension will be compared to indicate which are rated more highly than others. | 4 weeks | 
| Number of screens viewed in the mobile application | Objective data. This data will be collected automatically when users log into the application. | 8 weeks | 
| Total time of use of the mobile application | Objective data. This data will be collected automatically when users log into the application. | 8 weeks | 
| Number of days the mobile application was used | Objective data. This data will be collected automatically when users log into the application. | 8 weeks |