Table 1.
Sample characteristics
| Characteristic | Total sample, N = 439 933 |
|---|---|
| Age [mean (SD)] | 59.5 (8.1) |
| Sex [N (%)] | |
| Male | 194 854 (44.3) |
| Female | 245 079 (55.7) |
| Race [N (%)] | |
| Mixed/other | 6298 (1.4) |
| Asian/Asian British/Chinese | 9597 (2.2) |
| Black/Black British | 6601 (1.5) |
| White | 416 106 (94.9) |
| Attended college [N (%)] | |
| Yes | 142 955 (39.5) |
| No | 218 815 (60.5) |
| Employment status [N (%)] | |
| Unemployed | 35 829 (8.2) |
| Retired | 146 531 (33.6) |
| Employed | 253 835 (58.2) |
| Shift work [N (%)] | |
| Yes | 43,073 (9.9) |
| No | 392,597 (90.1) |
| Residence [N (%)] | |
| Urban | 369 446 (84.8) |
| Rural | 66 052 (15.2) |
| Sleep duration [N (%)] | |
| Short | 108 126 (24.6) |
| Adequate | 297 914 (67.7) |
| Long | 33 893 (7.7) |
| Timing preference [N (%)] | |
| Morning | 119 119 (27.1) |
| Somewhat morning | 156 149 (35.5) |
| Somewhat evening | 125 117 (28.4) |
| Evening | 39 557 (9.0) |