Table 2.

Summary of sample selection and characteristics of the analytical sample.

Sample Information	Wave 1	Wave 2	Wave 3	Wave 4	Wave 5	Pooled
	2006	2007–2008	2009	2011–2012	2013–2015
Survey sample size
Smoker (Urban)	4815	4844	5585	5560	3860	24664
Non-smoker (Urban)	1270	1221	1417	1422	1049	6379
Smoker (Rural)					3957	3957
Non-smoker (Rural)					1014	1014
Included: Current smoker (Urban)	4815	4627	5211	5082	3435	23170
Size of final analytical sample	3214	3186	3849	3727	2446	16422
Characteristics of analytical sample
Age group (%)
18–35	10.5%	9.6%	14.2%	13.2%	12.4%	12.1%
36–55	60.0%	61.5%	57.0%	54.9%	50.7%	57.0%
55+	29.5%	29.0%	28.8%	32.0%	36.9%	30.9%
Gender (%)
Male	95.5%	95.5%	95.7%	95.9%	95.0%	95.6%
Female	4.5%	4.5%	4.3%	4.1%	4.0%	4.4%
Household income (%)
Low income	87.5%	95.9%	93.2%	92.7%	80.7%	90.6%
High income	12.5%	4.1%	6.8%	7.3%	19.3%	9.4%
Education (%)
Low education	44.6%	43.1%	40.3%	39.6%	38.6%	41.3%
High education	55.4%	56.9%	59.7%	60.4%	61.4%	58.7%
Employment status (%)
Not employed	36.6%	37.3%	36.8%	40.9%	44.3%	38.9%
Employed	63.4%	62.7%	63.2%	59.1%	55.7%	61.1%
Smokers using brands by price tier (%)
I (most expensive)	11.3%	4.2%	7.6%	14.0%	19.9%	10.9%
II	31.5%	9.4%	2.8%	6.8%	9.6%	11.6%
III	48.1%	33.3%	47.9%	52.5%	55.7%	47.3%
IV	8.8%	39.9%	31.7%	20.7%	10.6%	23.2%
V (cheapest)	0.3%	13.3%	10.8%	5.9%	4.2%	7.0%
City of residence (%)
Beijing	14.8%	15.9%	14.0%	12.7%	18.7%	14.9%
Shenyang	12.2%	17.3%	15.6%	15.3%	18.7%	15.6%
Shanghai	21.5%	21.3%	16.7%	16.4%	24.6%	19.7%
Changsha	22.2%	19.1%	14.3%	15.2%	-	14.9%
Guangzhou	14.5%	10.9%	7.7%	7.9%	13.7%	10.6%
Kunming	-	-	18.0%	16.8%	24.4%	11.7%
Yinchuan	14.8%	15.5%	13.7%	15.7%	-	12.7%