Table 1. Demographic and smoking-related characteristics of the smokers, by country.

	China (%) (n = 4763)	Thailand (%) (n = 2000)	Australia (%) (n = 1767)	USA (%) (n = 1780)
Gender (male)	95.9	95.5	54.0	53.9
Age:
18–24	1.9	6.7	11.5	13.2
25–39	18.0	24.5	37.0	31.4
40–54	47.6	41.1	34.5	36.9
55+	32.4	27.7	16.9	18.5
Education:*
Low	13.7	75.0	62.7	45.9
Moderate	66.3	17.5	22.8	36.6
High	20.0	7.5	14.5	17.6
Income:
Low	20.8	54.6	28.1	36.9
Moderate	48.8	30.4	33.8	34.6
High	30.4	15.0	38.1	28.5
Cigarettes per day:
0–10	35.0	55.7	27.8	31.7
11–20	48.7	36.9	42.4	46.3
21+	16.3	7.4	29.8	22.0
Type of cigarettes smoked:
Factory-made only	93.8	41.8	74.8	90.0
Roll your own only	1.1	32.9	11.8	1.5
Both	5.1	25.3	13.4	8.4

Relative levels were used for education and income across countries.

*Education in China and Thailand: low, no schooling/elementary; moderate, middle school (secondary); high, tertiary (college or higher). Education in Australia and the US: low levels of education were considered to be completed high school or less; moderate levels were considered to be technical/trade/some university (no degree in Australia, and community college/trade/technical school/some university (no degree) in the US; high levels were those who completed university and/or postgraduate degrees.