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Table 2 Distribution of past month drug use by age according to group and time point

From: Efficacy evaluation of the school program Unplugged for drug use prevention among Brazilian adolescents

11–12 years Intervention Control Program Effect a
Baseline 4 month follow-up ORb (95% CI) p Baseline 4 month follow-up ORb (95% CI) p ORa (95% CI) p
N % N %    N % N %     
 Tobacco 1/296 0.3 3/296 1.0 Non-estimable   0/384 0.0 0/384 0.0 Non-estimable   Non-estimable  
 Alcohol 19/251 7.6 19/251 7.6 1.00 (0.32;3.14) . > 0.999 18/349 5.2 20/349 5.7 1.45 (0.43;4.83) 0.529 0.67 (0.12;3.77) 0.646
 Binge drinking 12/226 5.3 15/226 6.6 1.81 (0.51;6.44) 0.345 5/325 1.5 11/325 3.4 6.33 (0.91; 43.95 0.054 0.25 (0.17;1.54) 0.327
 Marihuana 0/249 0.0 2/249 0.8 Non-estimable   1/378 0.3 4/378 1.1 Non-estimable   Non-estimable  
 Inhalants 2/246 0.8 4/246 1.6 2.50 (0.34;18.30) 0.367 1/378 0.3 5/378 1.3 6.63 (0.62;70.63) 0.117 0.38 (0.02;7.73) 0.527
 Cocaine 0/246 0.0 1/246 0.4 Non-estimable   0/377 0.0 0/377 0.0 Non-estimable   Non-estimable  
 Crack 0/246 0.0 0/246 0.0 Non-estimable   0/377 0.0 0/377 0.0 Non-estimable   Non-estimable  
13–15 years
 Tobacco 11/441 2.5 15/441 3.4 2.10 (0.62;7.20) 0.235 17/547 3.1 17/547 3.1 1.00 (0.32;3.11) >0.99 1.45 (0.34;6.25) 0.615
 Alcohol 59/370 15.9 71/370 19.2 1.52 (0.90;2.56) 0.116 80/460 17.4 88/460 19.1 1.26 (0.79;2.01) 0.341 1.38 (0.76;2.50) 0.289
 Binge drinking 40/340 11.8 38/340 11.2 0.89 (0.47;1.71) 0.742 45/424 10.6 63/424 14.9 2.05 (1.16;3.63) 0.014 0.43 (0.31;1.46) 0.581
 Marihuana 7/432 1.6 13/432 3.0 2.41 (0.79;7.33) 0.120 7/546 1.3 15/546 2.7 3.21 (1.00;10.28) 0.050 0.75 (0.16;3.61) 0.722
 Inhalants 10/430 2.3 7/430 1.6 0.61 (0.19;1.91) 0.393 10/540 1.9 13/540 2.4 1.46 (0.54;3.96) 0.455 0.41 (0.09;1.91) 0.259
 Cocaine 0/431 0.0 5/431 1.2 Non-estimable   1/544 0.2 5/544 0.9 11.96 0.55;259.45) 0.114 Non-estimable  
 Crack 0/433 0.0 6/433 1.4 Non-estimable   1/545 0.2 5/545 0.9 11.49 (0.57;230.50) 0.111 Non-estimable  
  1. aOR for the multilevel analysis gllamm - intervention x control at 4 month follow-up adjusted for sex and baseline prevalence of drug use
  2. b OR for the multilevel analysis gllamm, 4 month follow up x baseline, in each group (or intervention or control), adjusted by sex