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Motivational interviewing is equivalent to more intensive treatment, superior to placebo, and will be tested more widely

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Q How effective are adaptations of motivational interviewing for changing problem behaviours?


Embedded ImageDesign:

Systematic review with meta-analysis.

Embedded ImageData sources:

PsycINFO (search date not stated), reference lists of three previous reviews, motivational interviewing website (, discussion with motivational interviewing trainers.

Embedded ImageStudy 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.

Embedded ImageOutcomes:

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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