Table 1.

General characteristics of the study participants.

Variable		N	%
Gender	Man	281	49.9
	Woman	282	50.1
Age group (years)	19–29	104	18.5
	30–39	110	19.5
	40–49	118	21.0
	50–59	111	19.7
	≥60	120	21.3
Education level	Elementary school or below	20	3.6
	Middle school	44	7.8
	High school	363	64.5
	College or above	136	24.2
Occupation	Non-manual	145	25.8
	Manual	271	48.2
	Other	146	26.0
Monthly income	<2.5 million won	122	21.7
	2.5–5.0 million won	378	67.1
	≥5.0 million won	63	11.2
Ambulatory care visit in the past 2 weeks	Yes	63	11.2
	No	500	88.8
Hospitalization in past 12 months	Yes	18	3.2
	No	545	96.8
Morbidity	Yes	53	9.4
	No	510	90.6