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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.