Table 1.

Demographic characteristics of the survey sample.

Characteristics	N	Percentage	Characteristics	N	Percentage
Gender			Population density
Female	518	3.1	Rural	8114	48.8
Male	16098	96.9	Urban	8502	51.2
Age			Household income (¥)
15–29	3106	18.7	<30000	4733	28.5
30–49	9338	56.2	≥30000	10301	62.0
50+	4172	25.1	Not available	1582	9.5
Education			Number of cigarettes smoked per day
Low	10467	63.0	1–10	5131	30.9
Medium	3817	23.0	11–20	8076	48.6
High	2332	14.0	21+	3409	20.5