Table 1. Demographic data of respondents (n = 2500).

	Total	Male	Female
Age (years)
20–29	624 (25.0%)	312 (25.0%)	312 (25.0%)
30–39	626 (25.0%)	313 (25.0%)	313 (25.0%)
40–49	626 (25.0%)	313 (25.0%)	313 (25.0%)
50–59	624 (25.0%)	312 (25.0%)	312 (25.0%)
Marital status
Unmarried	1108 (44.3%)	649 (51.9%)	459(36.7%)
Married	1392 (55.7%)	601(48.1%)	791(63.3%)
Number of children
0	1343 (53.7%)	740 (59.2%)	603 (48.2%)
1	407 (16.3%)	170 (13.6%)	237 (19.0%)
2	561 (22.4%)	249 (19.9%)	312 (25.0%)
3	164 (6.6%)	79 (6.3%)	85 (6.8%)
4	21 (0.8%)	11 (0.9%)	10 (0.8%)
more than 4	4 (0.2%)	1 (0.1%)	3 (0.2%)
Annual family income (yen/year)
less than 1,000,000	145 (5.8%)	81(6.5%)	64 (5.1%)
1,000,000–3,000,000	412 (16.5%)	185 (14.8%)	227 (18.2%)
3,000,000–5,000,000	686 (27.4%)	345 (27.6%)	341 (27.3%)
5,000,000–7,000,000	571 (22.8%)	276 (22.1%)	295 (23.6%)
7,000,000–10,000,000	417 (16.7%)	223 (17.8%)	194 (15.5%)
10,000,000–15,000,000	200 (8.0%)	109 (8.7%)	91 (7.3%)
15,000,000-	69 (2.8%)	31 (2.5%)	38 (3.0%)
Education
Junior high school	68 (2.7%)	36 (2.9%)	32 (2.6%)
High school	645 (25.8%)	308 (24.6%)	337 (27.0%)
Technical college	367 (14.7%)	177 (14.2%)	190 (15.2%)
Junior college	275 (11.0%)	16 (1.3%)	259 (20.7%)
University or graduate school	1144 (45.8%)	713 (57.0%)	431 (34.5%)
Others	1 (0.0%)	0 (0.0%)	1 (0.1%)
Experience of infertility
Yes	358 (14.3%)	122 (9.8%)	236 (18.9%)
None	2142 (85.7%)	1128 (90.2%)	1014 (81.1%)
Experience of infertility treatment
None	2259 (90.4%)	1166 (93.3%)	1093 (87.4%)
timed intercourse	206 (8.2%)	67 (5.4%)	139 (11.1%)
IUI (intrauterine insemination)	77 (3.1%)	24 (1.9%)	53 (4.2%)
IVF-ET (In vitro fertilization—embryo transfer)	44 (1.8%)	17 (1.4%)	27 (2.2%)
ICSI (intracytoplasmic sperm injection)	31 (1.2%)	13 (1.0%)	18 (1.4%)