Related Experiment Video
Updated: Apr 25, 2026

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
Published on: August 18, 2020
Typology of individuals with substance dependence based on a Montreal longitudinal catchment area study
Marie-Josée Fleury1, Guy Grenier, Jean-Marie Bamvita
1Department of Psychiatry, McGill University, 6875 LaSalle Blvd, Montreal, QC, H4H 1R3, Canada, marie-josee.fleury@douglas.mcgill.ca.
Abstract:
This study sought to develop a typology of individuals with substance dependence (ISD) based on a longitudinal survey (n = 2,434) and 121 ISD. The latter were divided into three groups: newly abstinent individuals, chronic dependents and acute dependents. Individuals' typology was developed by cluster analysis. Newly abstinent individuals had fewer emotional problems and mental disorders in the previous 12 months. Four classes of ISD were identified, labelled respectively "chronic multi-substance consumption and mental disorders comorbidities," "multi-substance consumption," "alcohol and marijuana consumption" and "alcohol consumption only." Strategies adapted to each of these profiles could be promoted for more effective treatment.
Related Concept Videos
Substance Use Disorders Affecting Sleep
Understanding the concepts of physical dependence,...
Drug Abuse and Addiction: Pharmacological Phenomena
Drug Dependence
Mechanistic Models: Compartment Models in Individual and Population Analysis
Longitudinal Research
Analysis of Population Pharmacokinetic Data

