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Table 3 Prevalence of drinking by grade

From: Psychosocial factors associated with smoking and drinking among Japanese early adolescent boys and girls: Cross-sectional study

 

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)

 
  1. Prevalence of alcohol use in the last six months among Japanese adolescent boys and girls by grade are shown.
  2. Significant at * p < 0.05; ** p < 0.01; *** p < 0.001 (two-tailed).
  3. a Does not total 2,923 due to missing data. (N = 2,902)
  4. b In the multiple comparison tests by the Kruskal Wallis test, there was significant difference among grades.
  5. 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.
  6. d The prevalence among 9th grader was higher than among 8th graders.
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