Table 1.

Characteristics of grade 12 students in years 1 to 5 (2012–2016) of the COMPASS study (n = 35,221) in Canada.

Variable	Levels	Total		Females (n = 17,953, 51%)		Males (n = 17,268, 49%)		Chi-square p-value
		n	%	n	%	n	%
Data collection year	2012	4906	13.9%	2470	13.8%	2436	14.1%	p = .5291
	2013	8579	24.4%	4338	24.2%	4241	24.6%
	2014	7539	21.4%	3879	21.6%	3660	21.2%
	2015	7179	20.4%	3646	20.3%	3533	20.5%
	2016	7018	19.9%	3620	20.2%	3398	19.7%
Ethnicity	White	27,898	79.2%	14,562	81.1%	13,336	77.2%	p < .0001
	Black	1604	4.6%	659	3.7%	945	5.5%
	Asian	2305	6.5%	1162	6.5%	1143	6.6%
	Indigenous	1029	2.9%	504	2.8%	525	3.0%
	Latin American/Hispanic	866	2.5%	404	2.3%	462	2.7%
	Other/mixed	1519	4.3%	662	3.7%	857	5.0%
Spending money	Zero	3876	11.0%	1780	9.9%	2096	12.1%	p < .0001
	$1 to $20	5838	16.6%	3022	16.8%	2816	16.3%
	$21 to $100	10,787	30.6%	6034	33.6%	4753	27.5%
	More than $100	11,277	32.0%	5370	29.9%	5907	34.2%
	Don't know	3443	9.8%	1747	9.7%	1696	9.8%
Current drinker	No	17,556	49.8%	9458	52.7%	8098	46.9%	p < .0001
	Yes	17,665	50.2%	8495	47.3%	9170	53.1%
Current cannabis user	No	27,231	77.3%	14,697	81.9%	12,534	72.6%	p < .0001
	Yes	7990	22.7%	3256	18.1%	4734	27.4%
Current smoker	No	29,720	84.4%	15,715	87.5%	14,005	81.1%	p < .0001
	Yes	5501	15.6%	2238	12.5%	3263	18.9%
Age of first use - alcohol	8	1586	4.5%	456	2.5%	1130	6.5%	p < .0001
	9	271	0.8%	88	0.5%	183	1.1%
	10	645	1.8%	236	1.3%	409	2.4%
	11	461	1.3%	177	1.0%	284	1.6%
	12	1623	4.6%	717	4.0%	906	5.2%
	13	2784	7.9%	1459	8.1%	1325	7.7%
	14	5909	16.8%	3234	18.0%	2675	15.5%
	15	6298	17.9%	3554	19.8%	2744	15.9%
	16	4990	14.2%	2762	15.4%	2228	12.9%
	17	1745	5.0%	904	5.0%	841	4.9%
	18	326	0.9%	148	0.8%	178	1.0%
	Never used	8583	24.4%	4218	23.5%	4365	25.3%
Age of first use - cannabis	8	539	1.5%	135	0.8%	404	2.3%	p < .0001
	9	87	0.2%	21	0.1%	66	0.4%
	10	161	0.5%	49	0.3%	112	0.6%
	11	180	0.5%	57	0.3%	123	0.7%
	12	551	1.6%	200	1.1%	351	2.0%
	13	1284	3.6%	564	3.1%	720	4.2%
	14	2851	8.1%	1357	7.6%	1494	8.7%
	15	3619	10.3%	1839	10.2%	1780	10.3%
	16	4084	11.6%	2153	12.0%	1931	11.2%
	17	2139	6.1%	1127	6.3%	1012	5.9%
	18	292	0.8%	131	0.7%	161	0.9%
	Never used	19,434	55.2%	10,320	57.5%	9114	52.8%
Age of first use - tobacco	8	750	2.1%	228	1.3%	522	3.0%	p < .0001
	9	154	0.4%	62	0.3%	92	0.5%
	10	237	0.7%	70	0.4%	167	1.0%
	11	236	0.7%	108	0.6%	128	0.7%
	12	691	2.0%	289	1.6%	402	2.3%
	13	1061	3.0%	508	2.8%	553	3.2%
	14	2029	5.8%	987	5.5%	1042	6.0%
	15	2414	6.9%	1191	6.6%	1223	7.1%
	16	3172	9.0%	1608	9.0%	1564	9.1%
	17	2053	5.7%	986	5.4%	1067	6.0%
	18	279	0.8%	111	0.6%	168	0.9%
	Never used	22,749	63.1%	12,027	65.9%	10,722	60.2%