Table 1.
Smoking prevalence by sex and school grade (1996, 2000, 2004)
| Sex | High school | Year (grade) | Lifetime smoking (%) | Current smoking (%) | Daily smoking (%) | Sample size | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 CI | 2000 CI | 2004 CI | 1996 CI | 2000 CI | 2004 CI | 1996 CI | 2000 CI | 2004 CI | 1996 | 2000 | 2004 | |||
| Male | Junior | 1st (7th) | 29.9 ± 0.5 | 22.5 ± 0.4 | 13.3 ± 0.3 | 7.5 ± 0.3 | 5.9 ± 0.2 | 3.2 ± 0.1 | 0.7 ± 0.1 | 0.5 ± 0.0 | 0.4 ± 0.0 | 7,211 | 8,248 | 6,917 |
| 2nd (8th) | 35.1 ± 0.5 | 28.0 ± 0.4 | 18.1 ± 0.3 | 10.8 ± 0.4 | 8.2 ± 0.3 | 4.8 ± 0.2 | 1.9 ± 0.1 | 1.9 ± 0.1 | 1.3 ± 0.1 | 7,152 | 8,541 | 6,845 | ||
| 3rd (9th) | 38.7 ± 0.5 | 35.4 ± 0.5 | 23.1 ± 0.4 | 14.4 ± 0.5 | 14.0 ± 0.4 | 7.3 ± 0.2 | 4.6 ± 0.3 | 5.2 ± 0.2 | 2.2 ± 0.1 | 7,108 | 8,559 | 6,917 | ||
| Subtotal | 34.6 ± 0.4 | 28.7 ± 0.4 | 18.2 ± 0.3 | 10.9 ± 0.3 | 9.4 ± 0.2 | 5.1 ± 0.1 | 2.4 ± 0.1 | 2.6 ± 0.1 | 1.3 ± 0.1 | 21,471 | 25,348 | 20,679 | ||
| Senior | 1st (10th) | 47.7 ± 0.8 | 45.0 ± 0.6 | 30.9 ± 0.6 | 24.7 ± 0.9 | 24.3 ± 0.7 | 11.3 ± 0.4 | 10.8 ± 0.6 | 12.4 ± 0.6 | 4.7 ± 0.2 | 12,079 | 10,590 | 12,235 | |
| 2nd (11th) | 52.6 ± 0.8 | 51.3 ± 0.5 | 35.9 ± 0.7 | 31.0 ± 1.0 | 29.5 ± 0.7 | 15.4 ± 0.5 | 18.3 ± 0.8 | 18.0 ± 0.6 | 8.2 ± 0.4 | 12,645 | 9,662 | 12,241 | ||
| 3rd (12th) | 55.6 ± 0.8 | 55.7 ± 0.6 | 42.0 ± 0.7 | 36.9 ± 1.0 | 36.9 ± 0.8 | 21.7 ± 0.6 | 25.4 ± 0.9 | 25.9 ± 0.7 | 13.0 ± 0.5 | 10,921 | 8,976 | 10,843 | ||
| Subtotal | 51.9 ± 0.8 | 50.3 ± 0.6 | 36.0 ± 0.6 | 30.7 ± 1.0 | 29.9 ± 0.7 | 15.9 ± 0.5 | 18.0 ± 0.8 | 18.4 ± 0.6 | 8.5 ± 0.3 | 35,645 | 29,228 | 35,319 | ||
| Female | Junior | 1st (7th) | 16.7 ± 0.4 | 16.0 ± 0.3 | 10.4 ± 0.3 | 3.8 ± 0.2 | 4.2 ± 0.2 | 2.4 ± 0.1 | 0.4 ± 0.0 | 0.4 ± 0.0 | 0.2 ± 0.0 | 7,158 | 7,124 | 6,229 |
| 2nd (8th) | 20.4 ± 0.4 | 20.5 ± 0.3 | 14.8 ± 0.3 | 5.4 ± 0.2 | 5.7 ± 0.2 | 3.7 ± 0.1 | 0.7 ± 0.1 | 1.0 ± 0.1 | 0.5 ± 0.0 | 6,966 | 7,375 | 6,234 | ||
| 3rd (9th) | 22.7 ± 0.4 | 23.5 ± 0.4 | 16.6 ± 0.4 | 5.5 ± 0.2 | 6.9 ± 0.2 | 4.8 ± 0.2 | 1.0 ± 0.1 | 1.8 ± 0.1 | 1.2 ± 0.1 | 7,203 | 7,399 | 6,243 | ||
| Subtotal | 19.9 ± 0.3 | 20.0 ± 0.2 | 13.9 ± 0.3 | 4.9 ± 0.1 | 5.6 ± 0.1 | 3.6 ± 0.1 | 0.7 ± 0.0 | 1.0 ± 0.0 | 0.6 ± 0.0 | 21,327 | 21,898 | 18,706 | ||
| Senior | 1st (10th) | 29.2 ± 0.6 | 30.6 ± 0.6 | 20.5 ± 0.5 | 9.2 ± 0.4 | 10.9 ± 0.4 | 6.5 ± 0.3 | 2.4 ± 0.1 | 3.0 ± 0.2 | 1.7 ± 0.1 | 12,617 | 10,552 | 9,580 | |
| 2nd (11th) | 33.6 ± 0.7 | 34.2 ± 0.6 | 24.6 ± 0.6 | 13.3 ± 0.5 | 13.0 ± 0.4 | 8.5 ± 0.4 | 4.5 ± 0.2 | 5.3 ± 0.2 | 3.3 ± 0.2 | 12,771 | 9,938 | 9,289 | ||
| 3rd (12th) | 38.5 ± 0.7 | 36.7 ± 0.6 | 27.0 ± 0.7 | 15.6 ± 0.5 | 15.8 ± 0.5 | 9.7 ± 0.4 | 7.1 ± 0.3 | 8.2 ± 0.3 | 4.3 ± 0.2 | 11,983 | 9,333 | 8,878 | ||
| Subtotal | 33.5 ± 0.6 | 33.7 ± 0.5 | 24.0 ± 0.6 | 12.6 ± 0.4 | 13.1 ± 0.4 | 8.2 ± 0.3 | 4.6 ± 0.2 | 5.4 ± 0.2 | 3.1 ± 0.2 | 37,371 | 29,823 | 27,747 | ||
CI, 95% Confidence interval
Lifetime smoking, Students who had tried smoking at least once; Current smoking, students who smoked ≥1 day of the 30 days preceding the survey; daily smoking, students who smoked every day of the 30 days preceding the survey