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OpenTrials
Completed

NCT Number: NCT04060602

Personalized Feedback Intervention to Reduce Risky Cannabis Use.

The purpose of this project is to determine whether participants who receive a personalized feedback report and educational materials about risky cannabis use will be less likely to report risky cannabis use at follow-up compared to participants who only received educational materials.

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Key information

Conditions

Cannabis Use

Age range

18 year–99 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Centre for Addiction Mental Health

Toronto, Ontario, M5S 2S1, Canada

About this study

This project aims to reduce risky cannabis use among those with less severe cannabis use, most of whom will never seek formal treatment. All of the participants will receive educational material regarding risky cannabis use and its prevention. Half of the participants will also be assigned by chance to receive a personalized feedback report.

The investigators hypothesize that:

  • Participants who receive the full personalized feedback intervention will be less likely to report risky cannabis use at 3- and 6-month follow-ups compared to participants who receive educational materials only (Primary Hypothesis).
  • Participants who receive the full personalized feedback intervention will report greater reductions in their perceptions of how much others use cannabis at a 3-month follow-up compared to participants who receive educational materials only.
  • Reductions in perceptions of how much others use cannabis at 3-month follow-up will be positively associated with reduction in the participant's risky cannabis use at 6-month follow-up.

A 2-arm parallel group randomized controlled trial will be conducted to test these hypotheses with follow-ups occurring at 3 and 6 months after randomization. Online media advertisements will be used to recruit people currently using cannabis. The advertisements will be placed across Canada using locations found successful in previous trials to rapidly recruit participants (e.g. Google AdWords).

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • Score of 4 or more on the Alcohol, Smoking, and Substance Involvement Screening Test, Cannabis subscale (ASSIST)

Exclusion criteria

  • Being under 18 years of age

Treatment and study plan

Personalized Feedback

Behavioral

A report comparing the participant's cannabis use to peer usage, and summarizing problems experienced and risk associated with future use.

Education

Behavioral

Canada's Lower-Risk Cannabis Use Guidelines prepared by the Centre for Addiction and Mental Health which outlines methods to help reduce health risks associated with cannabis use.

Primary outcomes

  1. Cannabis Use in the last 30 days

    Time frame: 3 and 6 months

    Change in the number of days participant used cannabis in the past 30-days from baseline

Secondary outcomes

  1. Alcohol, Smoking, and Substance Involvement Screening Test (ASSIST, cannabis subscale)

    Time frame: Baseline, 3 and 6 months

    Change in cannabis subscale scores from baseline. Scores are calculated as a sum of six items and totals can range from 0 to 39 with higher scores indicating greater risk.

  2. Perceptions of Cannabis Use by Peers in the past 3 months

    Time frame: Baseline, 3 months

    Change in participant's perceptions of how much their peers (same age and gender) use cannabis. Measured as a percentage of peers that do not use cannabis (%) and a 5-points Likert scale, 0 "Never" to 5 "Daily or Almost daily" of frequency of peer use

Sponsors and collaborators

Lead sponsor

Centre for Addiction and Mental Health

Other

Registry information

Official study title

Personalized Feedback Intervention to Reduce Risky Cannabis Use: Randomized Controlled Trial

Important dates

Study start
2019
Primary completion
2020
Study completion
2020
First posted
Aug 19, 2019
Registry last updated
Oct 27, 2020

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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