Characteristics of participants
| N (%) | ||||||
| Total | Male | Female | ||||
| Overall | 11 333 | (100) | 5391 | (100) | 5942 | (100) |
| Age (years) | ||||||
| 18–39 | 3888 | (34.3) | 1077 | (20.0) | 2811 | (47.3) |
| 40–64 | 6024 | (53.2) | 3295 | (61.1) | 2729 | (45.9) |
| ≥65 | 1421 | (12.5) | 1019 | (18.9) | 402 | (6.8) |
| Occupation | ||||||
| Employed | 7685 | (67.8) | 4235 | (78.6) | 3450 | (58.1) |
| Homemaker | 1806 | (15.9) | 25 | (0.5) | 1781 | (30.0) |
| Student | 407 | (3.6) | 122 | (2.3) | 285 | (4.8) |
| Unemployed | 1068 | (9.4) | 808 | (15.0) | 260 | (4.4) |
| Other | 367 | (3.2) | 201 | (3.7) | 166 | (2.8) |
| Annual household income (JPY) | ||||||
| <2.0 million | 633 | (5.6) | 308 | (5.7) | 325 | (5.5) |
| 2.0–3.9 million | 1990 | (17.6) | 947 | (17.6) | 1043 | (17.6) |
| 4.0–5.9 million | 2214 | (19.5) | 1150 | (21.3) | 1064 | (17.9) |
| 6.0–7.9 million | 1495 | (13.2) | 818 | (15.2) | 677 | (11.4) |
| ≥8.0 million | 2130 | (18.8) | 1247 | (23.1) | 883 | (14.9) |
| Unknown | 2871 | (25.3) | 921 | (17.1) | 1950 | (32.8) |
| Marital status (married) | 7043 | (62.1) | 3492 | (64.8) | 3551 | (59.8) |
| The presence of child (yes) | 6072 | (53.6) | 3091 | (57.3) | 2981 | (50.2) |