preventing alcohol and marijuana use among youth: what’s the evidence?
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Presented as part of a Canadian Institutes of Health funded Knowledge Translation Supplement grant (KTB-112487) (2 of 8 webinars). Recorded June 27, 2012.TRANSCRIPT
Welcome! This webinar has been made possible with support from the
Canadian Institutes of Health Research
Preventing Alcohol and Marijuana Use
Among Youth:
What’s the evidence? You will be placed on hold until the webinar begins.
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What’s the evidence? Lemstra, M., Bennett, N., Nannapaneni, U.,
Neudorf, C., Warren, L., Kershaw, T., Scott, C. (2010). A systematic review of school-based marijuana and alcohol prevention programs targeting adolescents aged 10-15. Addiction Research and Theory, 18(1): 84-96.
http://www.health-evidence.ca/articles/show/20397
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Welcome!
This webinar has been made possible with support from the Canadian Institutes of Health Research
Preventing Alcohol and Marijuana Use
Among Youth:
What’s the evidence?
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Review Lemstra, M., Bennett, N., Nannapaneni, U., Neudorf,
C., Warren, L., Kershaw, T., Scott, C. (2010). A systematic review of school-based marijuana and alcohol prevention programs targeting adolescents aged 10-15. Addiction Research and Theory, 18(1): 84-96.
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Summary Statement: Lemstra (2010) P 10-15 years I (A) Knowledge-only program: Provision of anti-drug
information in school setting (B) Comprehensive program: Intervention A plus
development of refusal, self- management, and social skills C Usual care OR knowledge only (e.g., pamphlet) O Primary outcome: Long-term reduction in
marijuana/alcohol use Secondary Outcomes: Effectiveness of Intervention A
vs. Intervention B
Quality Rating: 9 (strong)
Overall Considerations Comprehensive program: Mean reduction of 12 days of alcohol use/month 7 days of marijuana use/month
Knowledge-only program: Mean reduction of 2 days of alcohol use/month (non-significant) 25 days of marijuana use/month Confounding factors not considered (e.g. age, gender, socioeconomic status)
General Implications Public health SHOULD promote / support / implement: School-based Comprehensive programs Minimum one year duration Knowledge-only programs (if comprehensive programming is not
possible)
Summary of Included Studies
What’s the evidence? Comprehensive Programs Marijuana use Mean absolute reduction of 7 days/month (MUR
0.93, 95%CI 0.92-0.94) vs. no intervention
Alcohol use Mean absolute reduction of 12 days/month (MUR
0.88, 95%CI 0.87-0.89) vs. no intervention
Comprehensive Programs With & Without Stratification
Promote and support long-term comprehensive programming to reduce alcohol and marijuana use
Includes development of life skills, refusal skills and self-management skills in programming
Comprehensive programming is preferable to knowledge-only for reducing alcohol and marijuana use
Implications: Practice & policy Comprehensive Programs
What’s the evidence? Knowledge-only Programs
Marijuana use Single study reported a significant reduction Mean absolute reduction of 25 days/month (MUR
0.75, 95% CI 0.63 – 0.87) Insufficient data to pool statistically
Alcohol use Mean absolute reduction of 2 days/month (MUR
0.98, 95% CI 0.92-1.04)
Knowledge-only Programs With & Without Stratification
Shift existing knowledge-only programs to long-term comprehensive programs to reduce alcohol use
New programming should include a skill development focus to reduce both alcohol and marijuana use
Implications: Practice & policy Knowledge-only Programs
Overall Considerations Comprehensive program: Mean reduction of 12 days of alcohol use/month 7 days of marijuana use/month
Knowledge-only program: Mean reduction of 2 days of alcohol use/month (non-significant) 25 days of marijuana use/month Confounding factors not considered (e.g. age, gender, socioeconomic status)
General Implications Public health SHOULD promote / support / implement: School-based Comprehensive programs Minimum one year duration Knowledge-only programs if comprehensive programming is not
possible
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