Table 1. Baseline characteristics of the participants at Wave1.
| Total | Full-time | Part-time | None | p | ||
|---|---|---|---|---|---|---|
| N = 1768 | N = 220 | N = 273 | N = 1275 | |||
| Age | Mean(SD) | 73.4(7.0) | 70.2(4.8) | 71.1(5.1) | 74.3(7.3) | <0.001† |
| Sex | Male(%) | 42.2 | 68.6 | 52.6 | 36.1 | <0.001‡ |
| Educational attainment | college degree or more (%) | 25.6 | 26.2 | 30.7 | 24.6 | <0.001‡ |
| Annual couple income | ≤2.99 million JPY(%) | 64.5 | 38.8 | 55.9 | 70.5 | <0.001‡ |
| 3–4.99 million JPY | 24.0 | 30.8 | 25.9 | 22.6 | ||
| 5–9.99 million JPY | 8.3 | 20.3 | 12.1 | 5.5 | ||
| ≥10 million JPY | 3.2 | 10.1 | 6.2 | 1.5 | ||
| Occupation | Self-employed(%) | 16.2 | 41.2 | 22.7 | 10.5 | <0.001‡ |
† by F test
‡ by Chi-squared tests