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Table 1 Distribution of the adolescents at the baseline according to sociodemographic variables by study group (n = 3511)

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

  Baseline Matched
  Intervention   Control   Intervention   Control  
  (N = 1529) (N = 1982) (N = 938) (N = 1247)
  N % N % N % N %
Gender         
 Boys 733 48.8 957 49.1 426 45.7 575 46.6
 Girls 768 51.2 993 50.9 506 54.3 659 53.4
Years         
 11 – 12 480 34.4 740 40.7 358 40.1 478 41.5
 13 – 15 914 65.6 1079 59.3 534 59.9 673 58.5
Grade         
 6th grade 364 23.8 507 25.6 228 24.3 312 25.0
 7th grade 377 24.7 607 30.6 255 27.2 360 28.9
 8th grade 436 28.5 578 29.2 227 24.2 371 29.8
 9th grade 352 23.0 290 14.6 228 24.3 204 16.3
State         
 SP 951 68.2 1142 62.8 710 75.7 847 67.9
 SC 443 31.8 677 37.2 228 24.3 400 32.1