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. 2009 Nov 2;24(4):373–382. doi: 10.1093/heapro/dap037

Table 3:

Weighted substance use prevalence estimates across seventh and ninth grades by state and gender

Grade 7 males
Grade 7 females
Washington
Victoria
Washington
Victoria
% 95% CI
% 95% CI
% 95% CI
% 95% CI
Low High Low High Low High Low High
Recent alcohol use (past month) 11.5* 8.0 16.4 35.3* 30.0 40.9 13.2* 10.3 16.8 26.6* 22.3 31.3
Regular alcohol use (3+ past month) 3.4* 1.6 7.4 10.6* 7.6 14.6 2.9* 1.8 4.6 6.6* 4.6 9.4
Frequent alcohol use (6+ past month) 0.9* 0.3 2.2 4.6* 2.9 7.2 0.8 0.3 2.0 2.6 1.4 4.7
Frequent binge drinking (3+ times) 0.5 0.1 2.0 2.6 1.5 4.4 0.3 0.03 2.0 1.5 0.7 3.3
Past month use of tobacco 4.7 2.5 8.7 7.1 4.8 10.2 5.1 3.0 8.7 9.4 6.4 13.6
Past month use of illicit drugs 5.3 3.3 8.4 1.7 0.9 3.3 5.6 3.8 8.1 2.1 1.0 4.2
Past month use of both alcohol and tobacco 3.6 1.7 7.7 5.2 3.2 8.1 3.4 1.9 6.1 6.4 4.5 9.2
Past month use of both alcohol and illicit drugs 2.8 1.3 5.9 1.1 0.5 2.4 4.0 2.6 6.0 1.4 0.6 3.0
Past month any alcohol or drug use 14.3* 10.4 19.4 37.2* 31.7 43.1 15.6* 12.3 19.6 30.5* 25.8 35.8

Grade 9 males Grade 9 females

Recent alcohol use (past month) 23.4* 19.6 27.7 53.4* 47.6 59.1 25.9* 21.5 30.9 55.0* 48.3 61.5
Regular alcohol use (3+ past month) 9.4* 7.0 12.5 24.1* 20.0 28.7 9.1* 6.4 12.8 20.0* 15.6 25.3
Frequent alcohol use (6+ past month) 3.4* 2.2 5.1 11.8* 9.0 15.3 3.5 2.2 5.4 8.0 5.2 12.1
Frequent binge drinking (3+ times) 2.4* 1.5 3.9 6.5* 4.6 9.2 2.2 1.1 4.3 6.6 4.2 10.1
Past month use of tobacco 8.3 4.7 14.1 17.2 13.6 21.5 10.9* 7.7 15.1 26.1* 20.6 32.5
Past month use of illicit drugs 13.1 10.0 17.0 9.7 6.4 14.4 14.4 10.9 18.7 7.5 5.1 10.8
Past month use of both alcohol and tobacco 4.3* 2.6 6.8 15.2* 12.0 19.1 8.7* 6.0 12.3 22.0* 16.9 28.1
Past month use of both alcohol and illicit drugs 7.3 5.4 9.8 9.4 6.2 14.1 11.7 8.8 15.4 7.1 4.7 10.5
Past month any alcohol or drug use 31.3* 26.3 36.7 55.5* 49.6 61.3 31.2* 25.6 37.6 59.5* 52.7 66.0

Point estimates and CI were derived using STATA ‘svyset’ procedures. Estimates are adjusted for sample design weights, school nesting and adjust for state age differences. Figures in bold indicate statistically significant state differences (p<0.05). Non-overlapping CI for state comparisons of same-sex prevalence estimates indicated with an asterisk.