| |
None
|
1–2 times
|
Sometimes
|
Once a week
|
More than 2–3 times a week
| |
|---|
| |
N
|
(%)
|
N
|
(%)
|
N
|
(%)
|
N
|
(%)
|
N
|
(%)
| |
|---|
|
Totala
|
2241
|
(77.2)
|
324
|
(11.2)
|
245
|
(8.4)
|
42
|
(1.4)
|
50
|
(1.7)
| |
|
Boys
|
1118
|
(76.3)
|
158
|
(10.8)
|
130
|
(8.9)
|
21
|
(1.4)
|
39
|
(2.7)
| |
|
Girls
|
1123
|
(78.2)
|
166
|
(11.6)
|
115
|
(8.0)
|
21
|
(1.5)
|
11
|
(0.8)
| |
|
Gradea
| | | | | | | | | | |
**b
|
|
7th
|
708
|
(80.5)
|
81
|
(9.2)
|
68
|
(7.7)
|
14
|
(1.6)
|
8
|
(0.9)
|
***c
|
|
Boys
|
356
|
(80.0)
|
38
|
(8.5)
|
36
|
(8.1)
|
7
|
(1.6)
|
8
|
(1.8)
| |
|
Girls
|
352
|
(81.1)
|
43
|
(9.9)
|
32
|
(7.4)
|
7
|
(1.6)
|
0
|
(0)
| |
|
8th
|
786
|
(78.1)
|
111
|
(11.0)
|
80
|
(7.9)
|
14
|
(1.4)
|
16
|
(1.6)
|
*d
|
|
Boys
|
377
|
(76.0)
|
55
|
(11.1)
|
46
|
(9.3)
|
6
|
(1.2)
|
12
|
(2.4)
| |
|
Girls
|
409
|
(80.0)
|
56
|
(11.0)
|
34
|
(6.7)
|
8
|
(1.6)
|
4
|
(0.8)
| |
|
9th
|
747
|
(73.5)
|
132
|
(13.0)
|
97
|
(9.5)
|
14
|
(1.4)
|
26
|
(2.6)
| |
|
Boys
|
385
|
(73.3)
|
65
|
(12.4)
|
48
|
(9.1)
|
8
|
(1.5)
|
19
|
(3.6)
| |
|
Girls
|
362
|
(73.7)
|
37
|
(13.6)
|
49
|
(10.0)
|
6
|
(1.2)
|
7
|
(1.4)
| |
- Prevalence of alcohol use in the last six months among Japanese adolescent boys and girls by grade are shown.
- Significant at * p < 0.05; ** p < 0.01; *** p < 0.001 (two-tailed).
- a Does not total 2,923 due to missing data. (N = 2,902)
- b In the multiple comparison tests by the Kruskal Wallis test, there was significant difference among grades.
- c In the two-independent-sample tests by the Mann-Whitney U test between each of the two grades, the prevalence among 9th graders was higher than among 7th graders.
- d The prevalence among 9th grader was higher than among 8th graders.
