Table 1

Sample characteristics of adult smokers from Canada, Australia and Mexico

	Canada (n=3002)					Australia (n=3001)					Mexico (n=3003)
	W1 (%)	W2 (%)	W3 (%)	Total	p Value	W1 (%)	W2 (%)	W3 (%)	Total (%)	p Value	W1 (%)	W2 (%)	W3 (%)	Total (%)	p Value
Age
18–24	14	13	11	13		12	8	8	9	<0.05	20	20	20	20
25–34	22	22	23	22		21	22	24	22	<0.05	30	30	30	30
35–44	22	22	22	22		20	23	24	22		20	20	20	20
45–54	20	21	21	21		24	24	22	23		15	15	15	15
55–64	22	23	23	22		23	23	23	23		15	15	15	15
Sex
Male	41	43	44	42		42	42	43	42		55	55	53	54
Female	60	57	56	58		58	58	57	58		45	45	47	46
Education
High school or less	30	33	37	33	<0.001	34	38	37	36	<0.01	35	39	45	40	<0.001
College or some university	44	47	47	46		41	42	43	42	<0.01	19	22	21	21
Completed university or higher	26	20	16	21		25	20	20	22		46	39	34	40
Income
$29 999 or less	28	28	29	28		23	24	24	24		20	17	17	18
$30 000–$59 999	33	32	32	32		28	25	28	27		26	26	25	26
$60 000 or more	39	40	40	40		49	51	48	49		54	57	58	56
Quit intentions in next 6 months
Yes	53	57	58	56	<0.05	55	60	60	59		59	52	53	55	<0.01
Quit attempts in the past 4 months
Yes	58	60	63	60		60	66	66	64	<0.001	52	47	45	48	<0.01
Heaviness of smoking index
0	18	18	18	18		16	15	13	15	<0.05	65	63	63	64
1	12	10	10	11		12	9	10	10	<0.05	12	14	12	13
2	19	21	20	20		20	17	19	19		12	11	12	11
3	25	25	27	26		25	24	24	24		8	8	9	8
4+	26	26	25	25		27	35	33	32		4	4	4	4
Cigarette consumption
Non-daily	22	16	16	18	<0.001	21	12	13	15	<0.001	51	53	49	51
Daily	78	84	84	82		79	88	87	85	<0.001	49	47	51	49
Time in sample
1 wave	100	46	45	64	<0.001	100	38	32	57	<0.001	100	52	45	66	<0.001
2 waves	0	54	19	24		0	62	19	27	<0.001	0	48	23	23
3 waves	0	0	36	12		0	0	49	16		0	0	32	11

Omnibus χ² square tests for within-country differences in the distribution of characteristics across all three waves.