Table 2.

Demographic characteristics (n = 3795).

Characteristic	Type	N	%
Sex	Female	2126	56.0
	Male	1669	44.0
Age	40–65	2544	67.0
	≥65	1251	33.0
Education	<Middle school	1526	40.2
	≥Middle school	2269	59.8
Income	<300	1688	44.5
	≥300	2107	55.5
Type of insurance	National health insurance	3632	95.7
	Assistance	163	4.3
Private insurance	Y	2814	74.2
	N	981	25.8
Medical checkup	Y	857	22.6
	N	2938	77.4
Chronic disease	0	2033	53.6
	1	950	25.0
	<2	812	21.4