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Table 3 Probabilities of transition between drug use in the past month, considering the changes over time

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

11–12 years Transition from baseline to follow-up Intervention Control    
   N % N % OR 95%CI p
 Tobacco non-use to use 2/295 0.7 0/384 0.0 Non-estimable Non-estimable Non-estimable
use to non-use 0/1 0.0 0/0 0.0
 Alcohol non-use to use 8/232 3.4 7/331 2.1 1.77 0.46;6.83 0.409
use to non-use 8/19 42.1 5/18 27.8 2.49 0.45;13.73 0.296
 Binge drinking non-use to use 8/214 3.7 8/320 2.5 1.53 0.50;4.68 0.453
use to non-use 5/12 41.7 2/5 40.0 0.96 0.10;9.04 0.971
 Marihuana non-use to use 2/249 0.8 4/377 1.1 Non-estimable Non-estimable Non-estimable
use to non-use 0/0 0.0 1/1 100.0
 Inhalants non-use to use 3/244 1.2 5/377 1.3 Non-estimable Non-estimable Non-estimable
use to non-use 1/2 50.0 1/1 100.0
13–15 years
 Tobacco non-use to use 11/430 2.6 8/530 1.5 1.70 0.68;4.26 0.259
use to non-use 7/11 63.6 8/17 47.1 2.02 0.42;9.62 0.378
 Alcohol non-use to use 38/311 12.2 36/380 9.5 1.39 0.80;2.42 0.241
use to non-use 26/59 44.1 28/80 35.0 1.39 0.65;2.94 0.393
 Binge drinking non-use to use 17/300 5.7 36/379 9.5 0.57 0.31;1.08 0.084
use to non-use 19/40 47.5 18/45 40.0 1.28 0.53;3.12 0.583
 Marihuana non-use to use 12/425 2.8 10/539 1.9 1.53 0.66;3.59 0.323
use to non-use 6/7 85.7 2/7 28.6 17.49 1.16;63.21 0.039
 Inhalants non-use to use 5/420 1.2 9/530 1.7 0.70 0.23;2.11 0.528
use to non-use 8/10 80.0 6/10 60.0 2.56 0.34;19.18 0.358
  1. *cocaine and crack have been excluded from this table because only 1 transition has been observed in the use of each substance