A brief motivational intervention for young adults did not produce reductions in binge alcohol, marijuana use, or dual use days relative to a control condition, a recent study found. Researchers conducted a parallel, 2-group, randomized controlled trial with follow-up interventions conducted at 1, 3, 6, and 9 months, and final assessments at 12 and 15 months. Participants ranged in age from 18 to 25 years and reported at least monthly binge drinking and at least weekly marijuana use. Motivational intervention focused primarily on themes of emerging adulthood and the subjects' relationship to substance use (n=110) compared with an attention-matched health education control condition (n=116). Researchers found:
- 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 at all follow-up assessments.
- However, the treatment × time interaction was not statistically significant for alcohol, marijuana, or for dual use.
Stein MD, Caviness CM, Morse EF, et al. A developmental-based motivational intervention to reduce alcohol and marijuana use among non-treatment-seeking young adults: A randomized controlled trial. [Published online ahead of print October 16, 2017]. Addiction. doi:10.1111/add.14026.
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