Table 1. Participation rate in periodic health check-ups during the previous two years according to demographic, socioeconomic and life style variables.

Classification variables		Participants (n = 21,424)	Non-participants (n = 13,759)	P valuea
Gender				< 0.001
	Women	12,128 (58.9)	8,178 (41.1)
	Men	9,296 (61.1)	5,617 (38.9)
Age group, yr				< 0.001
	40–44	3,275 (59.2)	2,295 (40.8)
	45–49	2,788 (58.4)	1,838 (41.6)
	50–54	3,083 (62.1)	1,770 (37.9)
	55–59	3,065 (65.3)	1,538 (34.7)
	60–64	2,911 (65.5)	1,462 (34.5)
	65–69	2,720 (64.3)	1,467 (35.7)
	≥ 70	3,582 (49.2)	3,425 (50.8)
Residence				0.383
	Urban	16,026 (60.2)	10,166 (39.8)
	Rural	5,398 (59.3)	3,629 (40.7)
Region				< 0.001
	Seoul, Incheon, Gyeonggi	6,137 (57.4)	4,323 (42.6)
	Large metropolitan city	8,224 (62.2)	4,776 (37.8)
	Other area	7,063 (59.8)	4,696 (40.2)
Education				< 0.001
	Less than high school	10,106 (57.0)	7,323 (43.0)
	High school	6,312 (60.2)	3,894 (39.8)
	College	5,006 (64.7)	2,578 (35.3)
Income				< 0.001
	1st Q	4,822 (51.7)	4,214 (48.3)
	2nd Q	5,340 (56.7)	3,676 (43.3)
	3rd Q	5,365 (63)	3,035 (37)
	4th Q	5,693 (67.6)	2,635 (32.4)
Obesity				< 0.001
	Lean	484 (51.6)	460 (48.4)
	Normal	13,481 (61.1)	8,224 (38.9)
	Obese	7,459 (58.6)	5,111 (41.4)
Smoking status				< 0.001
	Non-smoker	13,026 (61)	8,103 (39)
	Past smoker	5,080 (64.4)	2,707 (35.6)
	Current smoker	3,318 (52.8)	2,985 (47.2)
Drinking status				< 0.001
	None	7,118 (56.6)	5,289 (43.4)
	Mild	9,973 (63.3)	5,497 (36.7)
	Moderate	2,299 (60.1)	1,469 (39.9)
	Severe	2,034 (56.4)	1,540 (43.6)
Exercise				< 0.001
	Yes	4,364 (63.1)	2,547 (36.9)
	No	17,060 (59)	11,248 (41)
Marriage				< 0.001
	Yes	21,101 (60.4)	13,347 (39.6)
	No	306 (43.8)	425 (56.2)
Employment status				< 0.001
	Employees	12,858 (62.9)	7,291 (37.1)
	Others	8,566 (55)	6,504 (45)

Data are presented as number (rate per 100).

^aχ² test for each classification variables for participation in periodic health check-ups.