Table 1.

Sample characteristics from all smoker observations in the USA, Mexico and Australia over six waves of data collection, 2012–2014

	USA (n=6865/4154), %	Mexico (n=5723/3366), %	Australia (n=5864/2710), %
Age
18–24	17	19	8
25–34	29	30	24
35–44	20	21	22
45–54	18	16	23
54–64	17	14	23
Sex
Male	50	55	46
Female	50	45	54
Education
≤High school	30	32	34
Some university	38	20	41
≥University	32	49	26
Income
Low	30	40	23
Medium	34	33	27
High	36	27	50
Race*
Caucasian	52
African-American	5	NA	NA
Latino	38
Other	4
HSI (mean)	2.2	0.8	2.7
Daily smoker
No	26	50	15
Yes	74	50	85
Quit intentions
No	56	54	57
Yes	44	46	43
Recent quit attempt
No	57	47	62
Yes	43	53	38

*Race only assessed for US sample.

HSI, heaviness of smoking index; n, umber of observations/number of individuals; NA, not applicable.