Table 1. Sex and age distribution of study participants by study area.

Study area	Men										Women
	Age (years)								Total		Age (years)								Total
	35–39		40–49		50–59		60–69				35–39		40–49		50–59		60–69
	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%
Chiba	4	2.7	22	14.8	56	37.6	67	45.0	149	100.0	30	8.4	138	38.7	118	33.1	71	19.9	357	100.0
Shizuoka	21	5.0	122	29.3	175	42.1	98	23.6	416	100.0	16	10.1	35	22.0	70	44.0	38	23.9	159	100.0
Okazaki	13	4.8	29	10.6	66	24.2	165	60.4	273	100.0	12	4.7	45	17.6	85	33.3	113	44.3	255	100.0
Aichi Cancer Center	12	4.4	32	11.6	115	41.8	116	42.2	275	100.0	33	10.9	88	29.0	102	33.7	80	26.4	303	100.0
Takashima	7	4.2	18	10.7	45	26.8	98	58.3	168	100.0	27	7.2	59	15.8	102	27.3	186	49.7	374	100.0
Kyoto	37	30.3	31	25.4	48	39.3	6	4.9	122	100.0	9	23.7	19	50.0	9	23.7	1	2.6	38	100.0
Tokushima	8	11.0	21	28.8	24	32.9	20	27.4	73	100.0	1	4.5	9	40.9	10	45.5	2	9.1	22	100.0
Fukuoka	0	0.0	0	0.0	60	31.9	128	68.1	188	100.0	0	0.0	0	0.0	96	37.5	160	62.5	256	100.0
Saga	0	0.0	31	12.7	82	33.5	132	53.9	245	100.0	0	0.0	64	19.3	127	38.4	140	42.3	331	100.0
Amami	1	0.5	53	24.7	82	38.1	79	36.7	215	100.0	1	0.3	77	25.7	135	45.0	87	29.0	300	100.0
Total	103	4.8	359	16.9	753	35.5	909	42.8	2124	100.0	129	5.4	534	22.3	854	35.7	878	36.7	2395	100.0