Table 1.
Baseline characteristics of patients infected with omicron or delta variants
| Variable and group | Delta, % (n=221 146) | Omicron, % (n=814 003) | Total |
|---|---|---|---|
| Country of birth | |||
| Non-UK | 11.3 | 11.4 | 117 764 |
| UK | 88.7 | 88.6 | 917 385 |
| Degree | |||
| No | 71.5 | 77.5 | 788 964 |
| Yes | 28.5 | 22.5 | 246 185 |
| Disability | |||
| None or day-to-day activities not limited or limited a little | 98.0 | 98.2 | 1 015 941 |
| Day-to-day activities limited a lot | 2.0 | 1.8 | 19 208 |
| Ethnicity | |||
| Black | 2.1 | 4.3 | 39 305 |
| Other | 4.7 | 6.6 | 63 944 |
| South Asian | 4.2 | 4.5 | 46 034 |
| White | 89.0 | 84.6 | 885 866 |
| Household deprivation | |||
| 1 | 59.1 | 58.6 | 607 754 |
| 2 | 26.6 | 27.2 | 280 530 |
| 3 | 10.2 | 9.9 | 103 552 |
| 4 | 3.0 | 2.7 | 28 721 |
| 5 | 0.3 | 0.2 | 2558 |
| Missing | 0.8 | 1.3 | 12 034 |
| Key worker* | |||
| No | 27.2 | 23.7 | 253 009 |
| Yes | 72.8 | 76.3 | 782 140 |
| Main language | |||
| English | 6.9 | 6.4 | 66 908 |
| Other | 93.1 | 93.6 | 968 241 |
| Previous covid-19 infection | |||
| No | 99.0 | 93.4 | 979 297 |
| Yes | 1.0 | 6.6 | 55 852 |
| Region | |||
| North East | 4.0 | 4.6 | 46 624 |
| North West | 16.6 | 19.1 | 192 220 |
| Yorkshire and the Humber | 12.7 | 11.4 | 120 800 |
| East Midlands | 9.2 | 7.7 | 83 248 |
| West Midlands | 11.5 | 8.1 | 91 289 |
| East of England | 13.3 | 10.9 | 118 094 |
| London | 12.0 | 19.9 | 188 942 |
| South East | 15.3 | 14.9 | 155 299 |
| South West | 5.3 | 3.3 | 38 633 |
| Sex | |||
| Male | 45.9 | 46.3 | 478 268 |
| Female | 54.1 | 53.7 | 556 881 |
| Count of comorbidities† | |||
| 0 | 88.5 | 87.6 | 908 641 |
| 1-2 | 11.1 | 12.0 | 122 585 |
| 3 | 0.4 | 0.4 | 39 23 |
| Vaccination status | |||
| Booster | 9.3 | 26.1 | 233 172 |
| One dose | 3.8 | 3.0 | 32 574 |
| Two doses AstraZeneca>180 days | 7.7 | 6.6 | 70 295 |
| Two doses AstraZeneca ≤180 days | 5.1 | 2.3 | 30 178 |
| Two doses mRNA >180 days | 25.2 | 16.2 | 187 980 |
| Two doses mRNA ≤180 days | 33.6 | 36.1 | 368 390 |
| Unvaccinated | 15.4 | 9.7 | 112 560 |
*
Information on 2011 census variables that were used to define key worker status.
†
Number of comorbidities grouped for disclosure control reasons, added as linear continuous predictor to fully adjusted model (model 4, adjusted for age, sex, vaccination status, previous infection, calendar time, socioeconomic factors, and comorbidities).