Table 1.

Participant characteristics obtained from the internet-based survey (N=200).

Participant characteristics			n (%)
Gender
	Male	90 (45)
	Female	110 (55)
Age, years
	20 to 29	32 (16)
	30 to 39	78 (39)
	40 to 49	59 (29)
	Over 50	30 (15)
	Not mentioned	1 (0.5)
Marital status
	Single	99 (49.5)
	Married	93 (46.5)
	Divorced/widowed	8 (4)
Education
	Junior high school	2 (1)
	High school	40 (20)
	College/vocational school	37 (18.5)
	Undergraduate	114 (57)
	Postgraduate	7 (3.5)
Individual income
	No income	31 (15.5)
	<2 million yen	69 (34.5)
	2 to 4 million yen	48 (24)
	4 to 6 million yen	34 (17)
	6 to 8 million yen	13 (6.5)
	8 to 10 million yen	5 (2.5)
Work status
	Employed	155 (77.5)
	Unemployed	45 (22.5)
Occupation type
	Managers	8 (4)
	Specialists/technicians	31 (15.5)
	Office work	37 (18.5)
	Manual work	19 (9.5)
	Service/marketing	21 (10.5)
	Others	42 (21)
	Unemployed	42 (21)
Employment contract
	Full-time	69 (34.5)
	Contract worker	16 (8)
	Temporary worker	6 (3)
	Part-time	28 (14)
	Self-employed	32 (16)
	Others	6 (3)
	Unemployed	43 (21.5)