National Drug Strategy
National Drug Strategy

Australian secondary school students' use of tobacco, alcohol, and over-the-counter and illicit substances in 2011

Appendixc 4: 95% confidence intervals

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95% confidence intervals associated with different estimates for gender and age sample sizes achieved in the 2011 ASSED study.

Table 4A.1: 95% confidence intervals for sample sizes achieved in ASSAD 2011 for male and females in each age group for proportions: 90%/10%; 80%/20%; 70%/30%; 60%/40%; 50%/50%.

Males

Age
(years)
n
90%/10%
80%/20%
70%/30%
60%/40%
[50%/50%
12
887
2.0
2.6
3.0
3.2
3.3
13
2,157
1.3
1.7
1.9
2.1
2.1
14
2,418
1.2
1.6
1.8
2.0
2.0
15
2,130
1.3
1.7
1.9
2.1
2.1
16
2,345
1.2
1.6
1.9
2.0
2.0
17
1,804
1.4
1.8
2.1
2.3
2.3
12-17
11,741
0.5
0.7
0.8
0.9
0.9

Females

Age
(years)
n
90%/10%
80%/20%
70%/30%
60%/40%
50%/50%
12
1.72.32.72.92.9
13
1.21.61.92.02.0
14
1.21.61.81.92.0
15
1.21.71.92.02.1
16
1.11.51.71.81.8
17
1.31.72.02.12.1
12-17
0.50.70.80.80.9


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