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Title: Effectiveness of motivational interviewing to reduce illicit drug use in adolescents : a systematic review and meta-analysis
Authors: Li, L
Zhu, S 
Tse, N
Tse, S
Wong, P
Keywords: Addiction disorder
Brief intervention
Client-centered approach
Counselling approach
Substance use
Young people
Issue Date: 2016
Publisher: Wiley-Blackwell
Source: Addiction, 2016, v. 111, no. 5, p. 795-805 How to cite?
Journal: Addiction 
Abstract: AimsMotivational interviewing (MI) is a commonly used intervention approach to promote reduction or cessation of substance abuse. Effects may be different for adolescents, so it is useful to assess the state of the evidence in this subpopulation. This paper aimed to assess evidence for MI effectiveness in adolescents. MethodEBSCOhost, ProQuest and Digital Dissertation Consortium were searched using keywords. Ten randomized trials from the United Kingdom, United States and Taiwan, including 1466 participants, were identified and analysed using a random effects model. Primary outcome measures captured were: the extent of drug use, intention to use drugs and readiness to change. Each study received a high-quality score based on the Miller Quality Scoring Coding System. Moderator analyses were also conducted to examine the impacts of follow-up period, delivery setting and study design on the effectiveness of MI. ResultsNo statistically significant effect of MI on was found change of drug use behaviours [d=0.05, 95% confidence interval (CI)=-0.06, 0.17, P=0.36]. A significant effect was found on attitude change (d=0.44, 95% CI=0.20, 0.67, P=0.0002). The funnel plot was asymmetrical, suggesting publication bias favouring small studies with higher effect sizes. ConclusionMotivational interviewing has not been found thus far to reduce adolescent use of illicit drugs. It may influence intentions to change, but evidence of publication bias weakens confidence in this conclusion.
ISSN: 0965-2140 (print)
1360-0443 (online)
DOI: 10.1111/add.13285
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