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Table 2 Prevalence (percent with their 95% confidence intervals) of students reporting various combinations of smoking in the past month (S), drinking in the past month (D) and cannabis use in the past year (C) by sex and age. Y: Yes, N: No

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
  S D C n % 95% CI % 95% CI % 95% CI
Boys N N N 226 41 34–49 44 36–52 24 18–30
  Y N N 31 5 3–9 5 2–10 5 3–10
  N Y N 135 20 15–27 18 13–24 27 20–35
  N N Y 14 2 1–4 4 2–9 2 1–6
  Y Y N 58 9 6–13 10 7–15 9 6–14
  N Y Y 12 2 1–4 1 0–5 3 1–7
  Y N Y 11 1 0–3 1 0–5 4 2–7
  Y Y Y 54 7 4–11 5 2–11 14 10–20
Girls N N N 286 50 43–57 43 36–50 35 27–43
  Y N N 20 3 1–7 3 1–7 4 2–8
  N Y N 180 25 20–32 28 21–35 31 25–38
  N N Y 19 4 2–8 4 2–7 1 0–4
  Y Y N 72 7 4–13 14 10–20 13 9–18
  N Y Y 5 1 0–3 1 0–4 1 0–4
  Y N Y 4 <1 0–3 1 0–4 1 0–4
  Y Y Y 28 3 1–6 3 1–8 8 5–13