Categorizing Cannabis and Alcohol Use Patterns of Emerging Adults in Psychiatric Partial Hospitalization Treatment.

BACKGROUND: Emerging adulthood is a common and problematic time for alcohol and cannabis use. Emerging adulthood also represents a vulnerable time period for anxiety and depression. Substance use and mental health issues are highly comorbid, yet substance use is commonly neglected in psychiatric care. OBJECTIVE: The goal of this study was to categorize the cannabis and alcohol use patterns of emerging adults in psychiatric care and to evaluate relationships with use-related problems, psychiatric symptomatology, and motives for use. METHODS: Participants were emerging adults who were consecutive admissions to a young adult psychiatric partial hospital program from 2017 to 2018. Of 318 participants who completed questionnaires, 244 (76.7%) reported cannabis and/or alcohol use in the previous month. Cluster analyses and analysis of variance tests were conducted to categorize and differentiate between participants who reported use. RESULTS: Results from cluster analyses identified 4 categories of use: low cannabis/high alcohol (35.7%), low cannabis/low alcohol (17.6%), high cannabis/low alcohol (29.1%), and high cannabis/high alcohol (17.6%). Individuals in categories with the highest rates of use and co-use reported more alcohol problems (F=24.31, P<0.001), cannabis problems (F=36.75, P<0.001), depression (F=3.60, P=0.01), and motives: social (F=6.12, P<0.001), coping with anxiety (F=20.43, P<0.001), coping with depression (F=17.80, P<0.001), enhancement (F=7.85, P<0.001), and conformity (F=4.92, P<0.01). CONCLUSIONS/IMPORTANCE: Clear categories of substance use emerged. Participants who were heavier users were more likely to use to alleviate psychiatric symptomatology, yet they also reported greater psychiatric symptomatology and use-related problems. Among a psychiatric sample of emerging adults, cannabis and alcohol use was common and problematic. Thus, substance use should be evaluated for and, if present, targeted with interventions during psychiatric care.

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

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.