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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.

Published in: Education, Health & Medicine
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Preventing Alcohol and Marijuana Use Among Youth: What’s the evidence?

  1. 1. This webinar has been made possible with support from the Canadian Institutes of Health Research Welcome! Preventing Alcohol and Marijuana Use Among Youth:What’s the evidence? You will be placed on hold until the webinar begins.The webinar will begin shortly, please remain on the line.
  2. 2. 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
  3. 3. Participant Side PanelHousekeeping in WebEx Use Q&A to post comments/questions during the webinar  ‘Send’ questions to All (not privately to ‘Host’) Connection issues  Recommend using a wired Internet connection (vs. wireless), to help Q&A prevent connection challenges WebEx 24/7 help line: 1-866-229-3239
  4. 4. This webinar has been made possible with support from the Canadian Institutes of Health Research Welcome! Preventing Alcohol and Marijuana Use Among Youth:What’s the evidence?
  5. 5. The Health Evidence Team Kara DeCorby Heather Husson Administrative Director Project ManagerMaureen DobbinsScientific DirectorTel: 905 525-9140 ext 22481E-mail: dobbinsm@mcmaster.ca Lori Greco Robyn Traynor Lyndsey McRae Knowledge Broker Research Coordinator Research Assistant
  6. 6. What is www.health-evidence.ca? Evidence inform Decision Making
  7. 7. Why use www.health-evidence.ca? 1. Saves you time 2. Relevant & current evidence 3. Transparent process 4. Supports for EIDM available 5. Easy to use
  8. 8. Knowledge Translation Supplement Project CIHR-funded KTB-112487
  9. 9. 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.
  10. 10. EvaluationPlease check your email for the evaluation survey link after the webinar. It take 5 minutes to complete!If you did not personally register for the webinar, please e-mail Jennifer McGugan at mcgugj@mcmaster.ca to be sent the survey
  11. 11. Questions?
  12. 12. Summary Statement:Lemstra (2010)P 10-15 yearsI (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 skillsC 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 BQuality Rating: 9 (strong)
  13. 13. Overall ConsiderationsComprehensive program: Mean reduction of 12 days of alcohol use/month 7 days of marijuana use/monthKnowledge-only program: Mean reduction of 2 days of alcohol use/month (non-significant) 25 days of marijuana use/monthConfounding factors not considered (e.g. age, gender,socioeconomic status)
  14. 14. General ImplicationsPublic health SHOULD promote / support / implement: School-based Comprehensive programs Minimum one year duration Knowledge-only programs (if comprehensive programming is not possible)
  15. 15. Summary of Included Studies
  16. 16. 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
  17. 17. Comprehensive ProgramsWith & Without Stratification
  18. 18. Implications: Practice & policyComprehensive Programs 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
  19. 19. 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)
  20. 20. Knowledge-only ProgramsWith & Without Stratification
  21. 21. Implications: Practice & policy Knowledge-only Programs 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
  22. 22. Overall ConsiderationsComprehensive program: Mean reduction of 12 days of alcohol use/month 7 days of marijuana use/monthKnowledge-only program: Mean reduction of 2 days of alcohol use/month (non-significant) 25 days of marijuana use/monthConfounding factors not considered (e.g. age, gender,socioeconomic status)
  23. 23. General ImplicationsPublic health SHOULD promote / support / implement: School-based Comprehensive programs Minimum one year duration Knowledge-only programs if comprehensive programming is not possible
  24. 24. Questions?
  25. 25. Posting BoardPlease continue to discuss this topic and other topics on our posting board. http://forum.health-evidence.ca/Login with your health-evidence username and password or register if you aren’t a member yet.
  26. 26. EvaluationPlease check your email and complete the evaluation survey for this webinarIf you did not receive an email with a link to the survey, please e-mail Jennifer McGugan: mcgugj@mcmaster.ca Thank you for your participation!

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