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
| Year | 1996 | 2000 | 2004 | 2008 | 2012 | 2017 | Reduction rate† |
| %* 95% CI |
%* 95% CI |
%* 95% CI |
%* 95% CI |
%* 95% CI |
%* 95% CI |
||
| Alcohol use in the past 30 days | |||||||
| High school graduation | 52.7 (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 degree | 46.7 (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 degree | 18.0 (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 graduation | 36.8 (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 degree | 23.4 (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 degree | 13.1 (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.