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Completed

NCT Number: NCT05620433

Joint Effort 2.0: a Mobile Application With University Students

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.

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Key information

Conditions

Cannabis Use Behavior Cannabis Cannabis Dependence Cannabis Smoking Cannabis Use, Unspecified Chemically-Induced Disorders Marijuana Abuse Marijuana Smoking Marijuana Use Mental Disorders Smoking Smoking, Non-Tobacco Products Substance-Related Disorders

Age range

18 year–35 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Université de Montréal

Montreal, Quebec, Canada

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Joint Effort

Other

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 information

Other

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.

Primary outcomes

  1. Change in Protective Behavioral Strategies for Marijuana (PBSM-17) used

    Time frame: 8 weeks

    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.

Secondary outcomes

  1. Change in intention to take action on cannabis use

    Time frame: 8 weeks

    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).

  2. Cannabis use frequency

    Time frame: 8 weeks

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

  3. Severity of Dependence

    Time frame: 8 weeks

    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).

  4. Subjective engagement with the developed mobile application (acceptability)

    Time frame: 4 weeks

    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.

  5. Number of screens viewed in the mobile application

    Time frame: 8 weeks

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

  6. Total time of use of the mobile application

    Time frame: 8 weeks

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

  7. Number of days the mobile application was used

    Time frame: 8 weeks

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

Sponsors and collaborators

Lead sponsor

Centre hospitalier de l'Université de Montréal (CHUM)

Other

Registry information

Official study title

Joint Effort, a Mobile Prevention and Harm Reduction Application

Acronym: JOINTEFFORT

Important dates

Study start
2023
Primary completion
2024
Study completion
2024
First posted
Nov 17, 2022
Registry last updated
Mar 12, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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