Table 1

Characteristics of respondents in the 2001 and 2009 Taiwan National Interview Surveys

	2001		2009
	n	Per cent	n	Per cent
Total	18 323	100.0	19 188	100.0
Sex
Male	9103	49.7	9165	50.4
Female	9220	50.3	10 023	49.6
Age group (years)
12–17	2167	11.8	2306	10.9
18–24	2865	15.6	2569	12.9
25–44	7943	43.3	8025	43.0
45–64	5348	29.2	6288	33.2
Urbanisation level
Metropolitan	4797	26.2	5978	31.2
Urban	4735	25.8	4808	29.6
Suburban	3183	17.4	3350	16.7
Rural	5353	29.2	5035	22.5
Missing	255	1.4	17	0.1
Education level
Primary or lower	3824	20.9	2450	11.7
Secondary	3793	20.7	3511	17.2
High school	6299	34.4	6525	33.6
College or university	4399	24.0	6693	37.5
Missing	8	0.0	9	0.0
Household monthly income (New Taiwan dollars)
≤29 999	3404	18.6	3689	16.0
30 000–49 999	4299	23.5	3991	20.5
50 000–69 999	4064	22.2	3358	17.8
70 000–99 999	3342	18.2	2645	15.5
≥100 000	3040	16.6	2656	16.0
Missing	174	0.9	2849	14.3