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Randomized Controlled Trial
. 2018 Mar;113(3):440-453.
doi: 10.1111/add.14026. Epub 2017 Oct 16.

A developmental-based motivational intervention to reduce alcohol and marijuana use among non-treatment-seeking young adults: a randomized controlled trial

Michael D Stein  1   2 , Celeste M Caviness  1 , Emily F Morse  1 , Kristin R Grimone  1 , Daniel Audet  1 , Debra S Herman  1   3 , Ethan Moitra  1   3 , Bradley J Anderson  1
Affiliations
Randomized Controlled Trial

A developmental-based motivational intervention to reduce alcohol and marijuana use among non-treatment-seeking young adults: a randomized controlled trial

Michael D Stein et al. Addiction. 2018 Mar.

Abstract

Aims: To test the hypothesis that among non-treatment-seeking emerging adults (EA) who both use marijuana and have alcohol binges, a brief, longitudinally delivered, developmentally based motivational intervention would show greater reductions in the use of these two substances compared with a health education control condition.

Design: Parallel, two-group, randomized controlled trial with follow-up interventions conducted at 1, 3, 6 and 9 months and final assessments at 12 and 15 months.

Setting: Hospital-based research unit in the United States.

Participants: Community-based 18-25-year-olds who reported at least monthly binge drinking and at least weekly marijuana use.

Intervention: Motivational intervention (EA-MI) focused primarily on themes of emerging adulthood (identity exploration, instability, self-focus, feeling in-between, a sense of possibilities) and the subjects' relationship to substance use (n = 110) compared with an attention-matched health education control condition (n = 116).

Measurements: The primary outcomes were days of binge alcohol, marijuana and dual use day as measured using the timeline follow-back method analysing the treatment by time interaction to determine relative differences in the rate of change between intervention arms.

Findings: At baseline, the mean rate (days/30) of binge drinking was 5.23 (± 4.31) of marijuana use was 19.4 (± 10.0) and of dual (same day) use was 4.11 (± 4.13). Relative to baseline, there were reductions in the rate of binge alcohol use, marijuana use and days of combined binge alcohol and marijuana use (P < 0.001) at all follow-up assessments. However, the treatment × time interaction was not statistically significant for alcohol (P = 0.37), for marijuana (P = 0.07) or for dual use (P = 0.55). Averaged over all follow-ups, mean reductions in binge, marijuana and dual use days were 1.16, 1.45 and 1.08, respectively, in the health education arm, and 1.06, 1.69 and 0.96 in EA-MI. Bayes factors were < 0.01 for frequency of binge alcohol use and frequency of dual binge alcohol and marijuana and 0.016 for marijuana use.

Conclusions: A brief, longitudinally delivered, developmentally based motivational intervention for young adults did not produce reductions in binge alcohol, marijuana use or dual use days relative to a control condition.

Keywords: Alcohol; RCT; brief intervention; cannabis; emerging adults; motivational intervention; multiple substance use disorders.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
CONSORT Flow Diagram
Figure 2
Figure 2
Mean 30-Day Rates of Binge Drinking and Marijuana Use by Month of Assessment and Intervention Condition.
See this image and copyright information in PMC

References

    1. World Health Organization. The health and social effects of nonmedical cannabis use. Geneva, Switzerland: 2016.
    1. World Health Organization. Alcohol Fact Sheet. 2015 Jan; http://www.who.int/mediacentre/factsheets/fs349/en/
    1. Center for Behavioral Health Statistics and Quality. Substance Abuse and Mental Health Services Administration; 2016. Key substance use and mental health indicators in the United States: Results from the 2015 National Survey on Drug Use and Health. (HHS Publication No. SMA 16-4984, NSDUH Series H-51) Retrieved from http://www.samhsa.gov/data/
    1. Center for Behavioral Health Statistics and Quality. Substance Abuse and Mental Health Services Administration; 2015. Behavioral health trends in the United States: Results from the 2014 National Survey on Drug Use and Health. (HHS Publication No. SMA 15-4927, NSDUH Series H-50) Retrieved from http://www.samhsa.gov/data/
    1. Johnston LD, M OMP, Bachman JG, Schulenberg JE, Miech RA. Monitoring the Future national survey results on drug use, 1975–2014: Volume 2, College students and adults ages 19–55. Ann Arbor, MI: Institute for Social Research, The University of Michigan; 2015.

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