Demographic features of participants
| Characteristic | Virus Watch full cohort | Current study participants |
| N=50 765* | N=3775* | |
| Age | ||
| <30 | 11 842 (23%) | 212 (5.6%) |
| 30–39 | 5411 (11%) | 468 (12%) |
| 40–49 | 6198 (12%) | 782 (21%) |
| 50–59 | 8186 (16%) | 1302 (34%) |
| 60+ | 19 128 (38%) | 1011 (27%) |
| Sex | ||
| Female | 23 427 (46%) | 2134 (57%) |
| Male | 18 884 (37%) | 1635 (43%) |
| Unknown | 8454 (17%) | 6 (0.2%) |
| Occupation | ||
| Administrative and secretarial | 2056 (4.1%) | 496 (13%) |
| Healthcare | 1225 (2.4%) | 327 (8.7%) |
| Indoor trades, process and plant | 1099 (2.2%) | 241 (6.4%) |
| Leisure and personal service | 819 (1.6%) | 146 (3.9%) |
| Managers, directors and senior officials | 1352 (2.7%) | 319 (8.5%) |
| Other professional and associate | 5403 (10.6%) | 1301 (34.0%) |
| Outdoor trades | 326 (0.6%) | 85 (2.3%) |
| Sales and customer service | 876 (1.7%) | 169 (4.5%) |
| Social care and community protective services | 875 (1.7%) | 185 (4.9%) |
| Teaching, education and childcare | 1896 (3.7%) | 430 (11%) |
| Transport and mobile machine | 382 (0.8%) | 76 (2.0%) |
| Not in employment (≥16 years)† | 14 731 (29.0%) | 0 (0.0%) |
| Child (≤15 years)‡ | 6548 (12.9%) | 0 (0.0%) |
| Unknown or unable to code | 13 177 (26.0%) | 0 (0.0%) |
| Ethnicity | ||
| White British | 34 196 (67.4%) | 3299 (87%) |
| White Irish | 601 (1.2%) | 47 (1.2%) |
| White Other | 2536 (5.0%) | 265 (7.0%) |
| South Asian | 2687 (5.3%) | 57 (1.5%) |
| Other Asian | 397 (0.8%) | 23 (0.6%) |
| Black | 468 (0.9%) | 17 (0.5%) |
| Mixed | 891 (1.7%) | 44 (1.2%) |
| Other ethnicity | 261 (0.5%) | 13 (0.3%) |
| Unknown | 8728 (17.2%) | 10 (0.3%) |
| Household income | ||
| £0–£24 999 | 9907 (19.5%) | 525 (14%) |
| £25 000–£49 999 | 11 893 (23.4%) | 1159 (31%) |
| £50 000–£74 999 | 7271 (14.3%) | 899 (24%) |
| £75 000+ | 7790 (15.3%) | 968 (26%) |
| Unknown | 13 904 (27.4%) | 219 (5.8%) |
| Region | ||
| East Midlands | 4183 (8.2%) | 327 (8.7%) |
| East of England | 9433 (19%) | 865 (23%) |
| London | 8444 (17%) | 560 (15%) |
| North East | 2218 (4.4%) | 158 (4.2%) |
| North West | 4670 (9.2%) | 411 (11%) |
| South East | 8346 (16%) | 767 (20%) |
| South West | 3141 (6.2%) | 251 (6.6%) |
| Wales | 1043 (2.1%) | 68 (1.8%) |
| West Midlands | 2350 (4.6%) | 188 (5.0%) |
| Yorkshire and The Humber | 2483 (4.9%) | 180 (4.8%) |
| Unknown | 4454 (8.8%) | 0 (0.0%) |
*n (%).
†See figure 1 for further detail.
‡Not asked about employment.