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Systematic review with meta-analysis.
PsycINFO (search date not stated), reference lists of three previous reviews, motivational interviewing website (www.motivationalinterview.org), discussion with motivational interviewing trainers.
Study selection and analysis:
Controlled clinical trials were included if the intervention used was based on motivational interviewing principles, was conducted individually and face to face, and used appropriate outcome measures. Effect sizes were calculated using Cohen’s d measure.
Effect sizes, combined effect sizes for individual problem areas, longevity of treatment effect, and social impact of treatment.
Thirty studies met the …
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