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Cannabis UseJOINTEFFORTNCT05620433

Joint Effort 2.0: a Mobile Application With University Students

A study testing Joint Effort and Brief normative feedback and standard information in people with Cannabis Use and Cannabis, run by Centre hospitalier de l'Université de Montréal (CHUM) at 1 site in Canada.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

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. Read more about this study

Who is it for?
Ages 18 to 35 yearsHealthy volunteers can take part
Conditions the study is for
Cannabis Use, Cannabis, Cannabis Dependence
What is being tested?
Joint Effort and Brief normative feedback and standard information
Could I receive a placebo?
No, everyone receives an active treatment
How many people
354 participants
Where
1 siteCanada
Study dates
8 Feb 2023to 28 Nov 2024
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 35 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • 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)

Who cannot join

  • None

Trial locations and contacts

1 site in 1 country.

Canada1 site

  • Université de Montréal

    Montreal, Quebec

Other trials in Canada

About this study

Official title: Joint Effort, a Mobile Prevention and Harm Reduction Application

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.

Read the detailed description

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.

Being tested
Joint Effort, Brief normative feedback and standard information
Medical subject headings
Marijuana Abuse, Marijuana Smoking

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Joint EffortOther

    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.

  • Brief normative feedback and standard informationOther

    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.

Study groups in NCT05620433
Study groupRoleWhat they receive
Joint Effort mobile applicationExperimentalThe 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.
Receives: Other: Joint Effort
Brief normative feedback and standard informationActive comparatorThe 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).
Receives: Other: Brief normative feedback and standard information

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. 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.

    Measured: 8 weeks

Secondary outcomes (7)

  1. 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).

    Measured: 8 weeks

  2. Cannabis use frequency

    The frequency of cannabis use will be assessed using a question previously used in the Quebec (Canada) Survey on Cannabis (2022).

    Measured: 8 weeks

  3. 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).

    Measured: 8 weeks

  4. 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.

    Measured: 4 weeks

  5. Number of screens viewed in the mobile application

    Objective data. This data will be collected automatically when users log into the application.

    Measured: 8 weeks

  6. Total time of use of the mobile application

    Objective data. This data will be collected automatically when users log into the application.

    Measured: 8 weeks

  7. Number of days the mobile application was used

    Objective data. This data will be collected automatically when users log into the application.

    Measured: 8 weeks

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted17 Nov 2022
  2. Study start8 Feb 2023
  3. Primary completion28 Nov 2024
  4. Study completion28 Nov 2024

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Prevention
Allocation
Not applicable
Intervention model
Parallel groups
Masking
Double blind
Who is masked
Investigator, Outcomes assessor
Enrolment
354 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05620433
Sponsor's protocol ID
2023-11154
Other IDs
2023
Acronym
JOINTEFFORT
Status last verified
Mar 2025
First submitted
8 Nov 2022
Last updated
12 Mar 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A study testing Joint Effort and Brief normative feedback and standard information in people with Cannabis Use and Cannabis, run by Centre hospitalier de l'Université de Montréal (CHUM) at 1 site in Canada.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 12 Mar 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Canada. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change in Protective Behavioral Strategies for Marijuana (PBSM-17) used (time frame: 8 weeks). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05620433.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 12 Mar 2025.

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