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A Meta-Analysis of Motivational Interviewing: Twenty-Five Years of Empirical Studies

Research on Social Work PracticePublished 11 January 2010
Brad Lundahl, Chelsea Kunz, Cynthia Brownell, Derrik R. Tollefson, Brian L. Burke
Citations1,084
SJR quartileQ1
SJR score0.72
SNIP1.09

Abstract

Objective: The authors investigated the unique contribution motivational interviewing (MI) has on counseling outcomes and how MI compares with other interventions. Method: A total of 119 studies were subjected to a meta-analysis. Targeted outcomes included substance use (tobacco, alcohol, drugs, marijuana), health-related behaviors (diet, exercise, safe sex), gambling, and engagement in treatment variables. Results: Judged against weak comparison groups, MI produced statistically significant, durable results in the small effect range (average g = 0.28). Judged against specific treatments, MI produced nonsignificant results (average g = 0.09). MI was robust across many moderators, although feedback (Motivational Enhancement Therapy [MET]), delivery time, manualization, delivery mode (group vs. individual), and ethnicity moderated outcomes. Conclusions: MI contributes to counseling efforts, and results are influenced by participant and delivery factors.

Keywords

PsychologyMedicine