Table 3.

Proportion of students reporting substance use by grade and sex (n=10 092)

Substance use	All students % (n)	Grade 7 %	Grade 8 %	Grade 9 %	Grade 10 %	p Value	Male %	Female %	p Value	National comparison data* %
Ever used tobacco	22.5 (2272)	11.2	20.0	29.8	35.0	<0.0001	23.4	21.6	0.0920	23.3%
Recent tobacco use	6.9 (700)	2.3	6.1	9.7	12.2	<0.0001	7.3	6.6	0.2724	6.7%
Ever consumed alcohol†	50.5 (5080)	30.3	45.5	62.8	74.6	<0.0001	54.2	46.8	<0.0001	74.0%
Recent alcohol use‡	13.6 (1367)	5.7	10.3	18.8	24.5	<0.0001	15.9	11.3	<0.0001	13.6%
Risk alcohol use§	14.8 (1488)	5.2	11.6	19.4	29.0	<0.0001	16.4	13.2	<0.0001
Recent marijuana use¶	6.3 (630)	1.5	4.7	9.4	12.2	<0.0001	7.9	4.7	<0.0001	6.8%
Recent other illicit drug use¶	2.6 (259)	1.0	2.3	3.5	4.4	<0.0001	3.3	1.9	<0.0001	2.9%

*Data from the 2011 Australian Secondary Students' Alcohol and Drug Survey (n=26 194).⁹

†35 missing (n=10 057).

‡37 missing (n=10 055).

§40 missing (n=10 052).

¶66 missing (n=10 026).