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Table 1 Smoking prevalence by sex and school grade (1996, 2000, 2004)

From: Decrease in the prevalence of smoking among Japanese adolescents and its possible causes: periodic nationwide cross-sectional surveys

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

  1. CI, 95% Confidence interval
  2. 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
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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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