A meta-analysis of motivational interviewing: Twenty-five years of empirical studies

TitleA meta-analysis of motivational interviewing: Twenty-five years of empirical studies
Publication TypeJournal Article
Year of Publication2010
AuthorsLundahl, BW, Kunz, C, Brownell, C, Tollefson, D, Burke, BL
JournalResearch on Social Work Practice
PublisherSage Publications
Place PublishedUS
Publication Languageeng
ISBN Number1049-73151552-7581
Accession Number2010-05015-001
Keywordscounseling outcomes, Intervention, interventions, motivational interviewing, Psychotherapeutic Counseling, Treatment Outcomes

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. (PsycINFO Database Record (c) 2010 APA, all rights reserved) (journal abstract)

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