Table 1.
Baseline characteristics of participants by baseline antibody status (n=2111)
| All residents (n=682) | Antibody-negative residents (n=456) | Antibody-positive residents (n=226) | All staff (n=1429) | Antibody-negative staff (n=1021) | Antibody-positive staff (n=408) | |
|---|---|---|---|---|---|---|
| Age, years | ||||||
| Median (IQR) | 86 (79–91) | 86 (80–92) | 86 (79–91) | 47 (34–56) | 46 (33–56) | 48 (36–57) |
| Range | 65–103 | 65–102 | 65–103 | 18–65 | 18–65 | 20–65 |
| Sex | ||||||
| Male | 208 (30%) | 137 (30%) | 71 (31%) | 174 (12%) | 122 (12%) | 52 (13%) |
| Female | 474 (70%) | 319 (70%) | 155 (69%) | 1255 (88%) | 899 (88%) | 356 (87%) |
| Region | ||||||
| East Midlands | 66 (10%) | 58 (13%) | 8 (4%) | 136 (10%) | 117 (11%) | 19 (5%) |
| East | 78 (11%) | 62 (14%) | 16 (7%) | 77 (5%) | 70 (7%) | 7 (2%) |
| London | 96 (14%) | 53 (12%) | 43 (19%) | 120 (8%) | 71 (7%) | 49 (12%) |
| North East | 128 (19%) | 60 (13%) | 68 (30%) | 355 (25%) | 217 (21%) | 138 (34%) |
| North West | 64 (9%) | 34 (7%) | 30 (13%) | 265 (19%) | 173 (17%) | 92 (23%) |
| South East | 78 (11%) | 44 (10%) | 34 (15%) | 129 (9%) | 83 (8%) | 46 (11%) |
| South West | 34 (5%) | 30 (7%) | 4 (2%) | 55 (4%) | 49 (5%) | 6 (1%) |
| West Midlands | 61 (9%) | 51 (11%) | 10 (4%) | 108 (8%) | 86 (8%) | 22 (5%) |
| Yorkshire and Humber | 77 (11%) | 64 (14%) | 13 (6%) | 184 (13%) | 155 (15%) | 29 (7%) |
| PCR tests (June, 2020–February, 2021) | ||||||
| Median (IQR) | 7 (5–9) | 7 (5–9) | 7 (5–10) | 17 (9–26) | 16 (9–24) | 20 (11–29) |
| Range | 1–18 | 1–17 | 1–18 | 1–55 | 1–55 | 1–52 |
| PCR tests during analysis time at risk | ||||||
| Median (IQR) | 3 (2–4) | 3 (2–5) | 3 (2–4) | 7 (4–11) | 7 (4–11) | 8 (5–11) |
| Range | 1–11 | 1–11 | 1–10 | 1–22 | 1–21 | 1–22 |
| Total available antibody test results | ||||||
| 1 | 117 (17%) | 86 (19%) | 31 (14%) | 510 (36%) | 385 (38%) | 125 (31%) |
| 2 | 173 (25%) | 121 (27%) | 52 (23%) | 457 (32%) | 337 (33%) | 120 (29%) |
| 3 | 392 (57%) | 249 (55%) | 143 (63%) | 462 (32%) | 299 (29%) | 163 (40%) |
Data are n (%), unless otherwise indicated.