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September 10, 2025Open Access

Concurrent Disorders and Treatment Outcomes: A Meta-Analysis

KSKatherine A. ScottUniversity of Maryland, Baltimore KGKevin M. GoreyUniversity of Windsor

Key Points

People with concurrent disorders respond less favorably to treatment interventions compared to those with single disorders.
Certain vulnerable groups, including women and racialized minorities, face further disadvantages in treatment outcomes.
Findings indicate a need for tailored interventions to support at-risk populations with concurrent disorders.
The meta-analysis synthesizes existing studies to offer robust insights into treatment effectiveness.

Abstract

Objectives This rapid review and meta-analysis explores two hypotheses. First, people with a concurrent mental health and substance use disorder (SUD) respond less favorably to currently utilized treatment interventions, than do those with a single disorder. Second, the potential for certain already vulnerable groups including women, members of racialized minority groups and those who live in or near poverty may be even further disadvantaged.

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