Table 1.

The participants’ demographic characteristics

	Japan		UK		Spain
	n	%	n	%	n	%
Age
20 s	791	19.9	393	19.8	396	19.8
30 s	793	19.9	398	20.0	400	20.1
40 s	800	20.1	399	20.1	399	20.0
50 s	799	20.1	399	20.1	400	20.1
≥ 60 s	798	20.0	398	20.0	400	20.1
Total	3981	100	1987	100	1995	100
Gender
Male	1984	49.8	993	50.0	997	50.0
Female	1997	50.2	994	50.0	998	50.0
Total	3981	100	1987	100	1995	100
Educational background
Junior high school/Secondary school	106	2.7	258	13.0	379	19.0
High school/A-level or equivalent	1223	30.7	601	30.2	242	12.1
Diploma course or vocational school	876	22.0	306	15.4	526	26.4
University degree or above	1776	44.6	822	41.4	848	42.5
Total	3981	100	1987	100	1995	100
Infected family or relatives
Yes	17	0.4	498	25.1	779	39.0
No	5909	95.1	1183	59.5	939	47.1
Uncertain	177	4.4	306	15.4	277	13.9
Total	3981	100	1987	100	1995	100
Infected persons in your workplace
Yes	45	1.1	342	17.2	377	18.9
No	3744	94.0	1263	63.6	1278	64.1
Uncertain	192	4.8	382	19.2	340	17.0
Total	3981	100	1987	100	1995	100