title: Delivering prevention for alcohol and cannabis using the Internet: a cluster randomised controlled trial.
abstract: OBJECTIVE
  To establish the efficacy of an internet based prevention program to reduce alcohol and cannabis use in adolescents.
  
  
  METHODS
  A cluster randomised controlled trial was conducted with 764 13-year olds from ten Australian secondary schools in 2007-2008. Half the schools were randomly allocated to the computerised prevention program (n=397), and half to their usual health classes (n=367). The Climate Schools: Alcohol and Cannabis prevention course is facilitated by the internet and consists of novel, evidence-based, curriculum consistent lessons aimed at reducing alcohol and cannabis use. Participants were assessed at baseline, immediately post, and at six months following the intervention.
  
  
  RESULTS
  Compared to the control group, students in the intervention group showed significant improvements in alcohol and cannabis knowledge at the end of the course and the six month follow-up. In addition, the intervention group showed a reduction in average weekly alcohol consumption and frequency of cannabis use at the six month follow-up. No differences between groups were found on alcohol expectancies, cannabis attitudes, or alcohol and cannabis related harms.
  
  
  CONCLUSIONS
  The course is acceptable, scalable and fidelity is assured. It increased knowledge regarding alcohol and cannabis, and decreased use of these drugs.
authors.affiliation: National Drug and Alcohol Research Centre, University of New South Wales, Australia. nickien@unsw.edu.au
authors.forename: Nicola C
authors.initials: NC
authors.lastname: Newton
authors.forename: Gavin
authors.initials: G
authors.lastname: Andrews
authors.forename: Maree
authors.initials: M
authors.lastname: Teesson
authors.forename: Laura E
authors.initials: LE
authors.lastname: Vogl
mesh_terms: D000293:Adolescent; D000428:Alcohol Drinking / Q000453:epidemiology / Q000517:prevention & control*; D000437:Alcoholism / Q000517:prevention & control*; D000704:Analysis of Variance; D001315:Australia / Q000453:epidemiology; D016000:Cluster Analysis; D003194:Computer-Assisted Instruction; D003479:Curriculum; D005260:Female; D015438:Health Behavior; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D013287:Illicit Drugs; D020407:Internet; D008297:Male; D002189:Marijuana Abuse / Q000453:epidemiology / Q000517:prevention & control*; D008385:Marijuana Smoking / Q000517:prevention & control*; D015233:Models, Statistical; D012309:Risk-Taking; D011795:Surveys and Questionnaires
chemical_list: D013287:Illicit Drugs