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Table 4 Prevalence odds ratio (POR) for cigarette smoking and 95% confidence interval (CI) among 11–15-year-old adolescents by study year, HBSC survey 1994–2006

From: Cigarette and waterpipe smoking among adolescents in Estonia: HBSC survey results, 1994–2006

Study year POR (95% CI)
  Age groups
  11-year-olds 13-year-olds 15-year-olds
  Boys
1994 1 1 1
1998 1.64 (0.82–3.29) 1.45 (0.97–2.17) 1.09 (0.79–1.51)
2002 1.96 (1.16–3.31) 2.20 (1.57–3.07) 1.42 (1.11–1.81)
2006 1.19 (0.67–2.09) 1.60 (1.13–2.25) 1.16 (0.92–1.47)
  Girls
1994 1 1 1
1998 3.36 (0.75–15.10) 1.49 (0.77–2.86) 2.24 (1.53–3.29)
2002 5.92 (1.72–20.29) 6.15 (3.69–10.25) 3.30 (2.39–4.54)
2006 3.44 (0.97–12.24) 4.38 (2.60–7.38) 3.26 (2.38–4.46)