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.