Identifying treatment response subgroups for adolescent cannabis use

Area of Science:

• Psychiatry
• Psychology
• Addiction Medicine

Background:

• Outpatient treatments for adolescent substance use yield variable results, with low effect sizes and high relapse rates.
• Treatment response is heterogeneous, necessitating identification of distinct patient subgroups.

Purpose of the Study:

• To identify subgroups of treatment response among adolescents undergoing behavioral treatments for substance use.
• To analyze patterns of treatment response over time using cluster analysis.

Main Methods:

• Cluster analysis was performed on 194 adolescents with cannabis use.
• Clustering was based on cannabis use frequency at five time points: intake, end of treatment, and 3, 6, and 9 months post-treatment.
• Subgroups were compared on demographic, psychopathology, and substance use variables.

Main Results:

• Four distinct clusters emerged: Low Use Responders, High Use Responders, Relapsers, and Non-Responders.
• Cannabis dependence, daily use frequency, and socioeconomic status predicted cluster membership.
• Relapsers showed a decrease followed by a rapid increase in use post-treatment.

Conclusions:

• Cluster analysis empirically identified distinct adolescent treatment response patterns.
• Understanding these homogenous subgroups offers insights into treatment outcomes.
• Predictive variables can help identify adolescents needing more intensive interventions.