Table 2

Prevalence of alcohol use and/or smoking among Japanese adolescents (aged 12–18 years) between 1996 and 2017 by sex

Year199620002004200820122017P value*
%
95% CI
%
95% CI
%
95% CI
%
95% CI
%
95% CI
%
95% CI
BoysNo use†50.3
(50.9 to 49.7)
54.7
(55.3 to 54.1)
66.4
(66.9 to 65.9)
80.4
(80.8 to 80.0)
86.9
(87.2 to 86.6)
93.3
(93.5 to 93.0)
<0.01
Alcohol use only†23.9
(24.2 to 23.6)
24.2
(24.6 to 23.9)
21.5
(21.8 to 21.3)
12.7
(12.8 to 12.5)
9.2
(9.3 to 9.0)
5.1
(5.3 to 5.0)
<0.01
Smoking only†6.9
(7.1 to 6.8)
5.8
(6.0 to 5.7)
3.2
(3.3 to 3.1)
2.3
(2.4 to 2.2)
1.3
(1.4 to 1.3)
0.5
(0.5 to 0.5)
<0.01
Co-use†18.9
(19.5 to 18.3)
15.3
(15.7 to 14.8)
8.9
(9.1 to 8.6)
4.7
(4.9 to 4.5)
2.6
(2.7 to 2.5)
1.1
(1.2 to 1.0)
<0.01
GirlsNo use†63.2
(63.6 to 62.8)
62.8
(63.3 to 62.4)
70.3
(70.7 to 69.8)
82.8
(83.1 to 82.4)
87.3
(87.5 to 87.0)
95.0
(95.2 to 94.8)
<0.01
Alcohol use only†26.7
(25.2 to 25.3)
27.2
(27.5 to 26.8)
23.3
(23.7 to 23.0)
13.8
(14.1 to 13.6)
11.0
(11.2 to 10.8)
4.3
(4.4 to 4.1)
<0.01
Smoking only†2.3
(2.3 to 2.2)
2.3
(2.4 to 2.2)
1.5
(1.5 to 1.4)
0.9
(0.9 to 0.8)
0.4
(0.4 to 0.3)
0.2
(0.2 to 0.1)
<0.01
Co-use7.8
(8.0 to 7.6)
7.7
(7.9 to 7.5)
5.1
(5.1 to 4.8)
2.5
(2.6 to 2.4)
1.4
(1.4 to 1.3)
0.6
(0.6 to 0.5)
<0.01
BothNo use†56.8
(57.3 to 56.3)
58.6
(59.1 to 58.2)
68.1
(68.6 to 67.7)
81.6
(81.9 to 81.2)
87.1
(87.3 to 86.8)
94.1
(94.3 to 93.9)
<0.01
Alcohol use only†25.3
(25.5 to 25.1)
25.6
(25.9 to 25.4)
22.4
(22.6 to 22.1)
13.2
(13.4 to 13.0)
10.1
(10.2 to 9.9)
4.7
(4.9 to 4.6)
<0.01
Smoking only†4.6
(4.7 to 4.4)
4.1
(4.2 to 4.0)
2.4
(2.5 to 2.3)
1.6
(1.6 to 1.5)
0.9
(0.9 to 0.8)
0.3
(0.4 to 0.3)
<0.01
Co-use†13.3
(13.7 to 12.9)
11.6
(11.9 to 11.3)
7.1
(7.3 to 6.9)
3.6
(3.8 to 3.5)
2.0
(2.1 to 1.9)
0.9
(0.9 to 0.8)
<0.01
  • *Based on the Cochran-Armitage trend test.

  • †In the past 30 days.