Table 4

Prevalence of alcohol use and smoking among Japanese senior high school students (aged 15–18 years) between 1996 and 2017 by the intention to pursue further education

Year199620002004200820122017Reduction rate†
%*
95% CI		%*
95% CI		%*
95% CI		%*
95% CI		%*
95% CI		%*
95% CI
Alcohol use in the past 30 days
 High school graduation52.7
(52.6 to 52.9)		53.1
(52.9 to 53.2)		43.7
(43.6 to 43.9)		29.2
(29.0 to 29.3)		19.9
(19.8 to 20.0)		9.4
(9.4 to 9.5)		0.82
 Junior college degree46.7
(46.6 to 46.8)		47.1
(47.0 to 47.2)		42.8
(42.6 to 42.9)		28.8
(28.7 to 29.0)		21.6
(21.5 to 21.7)		9.8
(9.7 to 9.8)		0.79
 College or higher educational degree18.0
(17.9 to 18.1)		16.6
(16.5 to 16.6)		10.1
(10.1 to 10.2)		5.7
(5.7 to 5.8)		3.2
(3.1 to 3.2)		1.8
(1.8 to 1.8)		0.90
Smoking in the past 30 days
 High school graduation36.8
(36.7 to 36.9)		37.7
(37.5 to 37.8)		23.7
(23.6 to 23.8)		15.5
(15.4 to 15.7)		7.6
(7.5 to 7.6)		4.0
(3.9 to 4.0)		0.89
 Junior college degree23.4
(23.3 to 23.5)		22.6
(22.5 to 22.7)		15.3
(15.2 to 15.4)		10.2
(10.1 to 10.3)		5.0
(4.9 to 5.0)		3.0
(3.0 to 3.1)		0.87
 College or higher educational degree13.1
(13.0 to 13.2)		14.6
(14.6 to 14.7)		6.7
(6.6 to 6.7)		3.1
(3.1 to 3.1)		1.4
(1.3 to 1.4)		1.0
(1.0 to 1.0)		0.92

  • *Adjusted for grade and sex.

  • †Reduction rate = (prevalence in 1996 − prevalence in 2017)/prevalence in 1996.