Table 1. Comparison of characteristics for participants and non-participants in the annual health check-ups.

			Participants	Non-participants	p-value
Numbera			54,748 (32.8)	112,218 (67.2)
Ageb	years		68 (63, 71)	64 (52, 69)	<0.001
Sexa
		Men	22,260 (40.7)	56,367 (50.2)	<0.001
		Women	32,488 (59.3)	55,851 (49.8)
Equivalent incomea	million yen
		0.00	6,647 (12.1)	20,892 (18.6)	<0.001
		0.01–1.00	15,941 (29.1)	34,759 (31.0)
		1.01–2.00	20,171 (36.8)	33,570 (29.9)
		2.01–	11,989 (21.9)	22,997 (20.5)
Number of family membersa
		1	12,109 (22.1)	32,638 (29.1)	<0.001
		2	34,587 (63.2)	54,382 (48.5)
		3 or more	8,052 (14.7)	25,198 (22.5)
Shortest travel timeb	minutes		6.1 (3.7, 9.9)	6.3 (3.8, 10.5)	<0.001
Densityb	number of facilities		18 (9, 28)	17 (8, 26)	<0.001
2SFCAb	×10−4		3.0 (2.3, 3.9)	2.9 (2.2, 3.9)	<0.001
E2SFCA with slow decayb	×10−4		2.9 (2.2, 3.8)	2.8 (2.1, 3.8)	<0.001
E2SFCA with quick decayb	×10−4		3.0 (1.8, 4.2)	2.9 (1.7, 4.2)	0.002

^a Data shown as number (percent); chi-squared test was used.

^b Data shown as median (25^th percentile, 75^th percentile); Mann–Whitney U test was used.