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Table 1 Study characteristics for studies reporting categorical measures on alcohol use

From: Effectiveness of school-based preventive interventions on adolescent alcohol use: a meta-analysis of randomized controlled trials

Study N Gender boys Age School level Program Program intensity Outcome Time points in months OR T1 OR T2 OR T3 OR T4
Bodin et al. 2011 [60] 1752 49% 14.50 HS ÖPP Medium a 12, 30 0.83 0.90   
Bond et al. 2004 [56] 2678 47% 14.00 HS GP High c 12, 24, 36 0.82* 0.88 0.84*  
Caria et al. 2011 [68] 5541 51% 13.00 JHS EU-Dap High a 18 0.93    
Clayton et al. 1991 [70] 1927 51% 11.50 JHS Project DARE High c 6, 12, 24 1.06 1.12 1.00  
Ellickson et al. 1990 [46] 3852 49% 13.00 JHS Project ALERT High a, b 3, 12, 15 0.99 1.03 0.99  
Furr-Holden et al. 2004 [49] 566 54% 13.00 JHS GBG High c 24 1.04    
Griffin et al. 2009 [52] 178 54% 13.50 JHS The Brave High b 12 0.13***    
Koning et al. 2009 [44] 2570 51% 12.70 JHS HSD Medium a 8, 12 0.96 0.80*   
McBride et al. 2004 [71] 2343 - 13.00 JHS SHAHRP High a, b 8, 12, 18 0.80 0.80* 0.87  
McCambridge et al. 2011 [50] 416 55% 17.50 HS MI Low C 3, 12 1.22 1.04   
Ringwalt et al. 1991[54] 1270 48% 10.40 JHS Project DARE High C 3 1.22    
Ringwalt et al. 2009 [59] 6028 49% 10.50 JHS Project ALERT High b, c 24 1.08    
Schinke et al. 2000 [67] 1396 51% 10.28 ES LST High A 6, 18, 30, 42 0.66*** 0.78 0.80 0.68**
Spoth et al. 2002 [55] 919 52% 10.50 JHS LST High C 12 0.94    
St. Pierre et al. 2005 [72] 1649 50% 10.50 JHS Project ALERT Medium B 24 1.09    
Sun et al. 2008 [69] 2064 53% 15.70 HS TND-4 Medium B 12 1.00    
  1. Note. a = Report changes in weekly alcohol use, b = Report changes in monthly alcohol use, c = Report changes in lifetime alcohol use. OR = Odds Ratio. JHS = Junior High School; HS = High School; ES = Elementary School. EU-Dap = European Drug Abuse Prevention; GBG = Good Behavior Game; GP = Gatehouse Project; HSD = Healthy School and Drugs; LST = Life Skills Training; MI = Motivational Interview; ALERT = Adolescent Learning Experiences in Resistance Training; DARE = Drug Abuse Resistance Education; ÖPP = Örebro Prevention Programme; The BRAVE = Building Resiliency and Vocational Excellence; TND-4 = Project Towards No Drugs Abuse. *p < .05. **p < .01 ***p < .001.