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Table 1 Prevalence (percent with their 95% confidence intervals) of students reporting risk behaviors, by sex and age

From: Clustering of smoking, alcohol drinking and cannabis use in adolescents in a rapidly developing country

  Age 11–13 years 14 years 15–17 years Total
   % 95% CI % 95% CI % 95% CI % 95% CI
Boys n 257   160   203   620  
  Ever smoking 46 38 - 54 53 45 - 61 67 60 - 73 54 50 - 59
  Smoking in the past month 27 20 - 35 24 18 - 31 38 30 - 45 30 26 - 34
  Drinking in the past month 45 38 - 59 40 35 - 46 63 56 - 69 49 45 - 54
  Ever drunkenness 40 33 - 47 44 35 - 53 58 50 - 66 47 42 - 61
  Ever cannabis 15 10 - 22 15 11 - 21 29 23 - 37 20 17 - 22
  Cannabis in the past year 15 10 - 19 12 8 - 18 26 20 - 33 17 15 - 20
Girls n 274   193   187   654  
  Ever smoking 30 24 - 36 44 36 - 52 56 50 - 62 41 38 - 45
  Smoking in the past month 15 10 - 22 23 18 - 29 28 22 - 35 21 18 - 25
  Drinking in the past month 41 34 - 48 47 39 - 55 58 49 - 65 48 43 - 52
  Ever drunkenness 35 29 - 42 44 37 - 51 52 45 - 60 43 39 - 47
  Ever cannabis 6 4 - 9 6 3 - 12 16 12 - 21 9 7 - 11
  Cannabis in the past year 6 4 - 10 5 2 - 11 12 9 - 18 8 6 - 10