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Preventing Alcohol and Marijuana Use

Among Youth:

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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?

Maureen Dobbins Scientific Director Tel: 905 525-9140 ext 22481 E-mail: dobbinsm@mcmaster.ca

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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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Questions?

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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