Table 1.
Variables used in the analyses
| Variable | Coding | Source |
| Vaccinated | Received a first dose of a COVID-19 vaccine by 15 March 2020 | NIMS |
| Age | Third-order polynomial | 2011 Census |
| Sex | Female, male | 2011 Census |
| Ethnicity | White British, Bangladeshi, Black African, Black Caribbean, Chinese, Indian, Mixed, Other, Pakistani, White other | 2011 Census |
| Religious affiliation | Christian, Buddhist, Hindu, Jewish, Muslim, no religion, other religion, religion not stated, Sikh | 2011 Census |
| Region | Dummy variables representing region of residence | 2019 NHS Patient Register |
| Rural–urban classification | Urban, rural | 2019 NHS Patient Register |
| Index of Multiple Deprivation | Dummy variables representing quintiles of deprivation | 2019 NHS Patient Register |
| Household tenure | Own, social rented, private rented, other | 2011 Census |
| Level of highest qualification | Degree, A-level or equivalent, GCSE or equivalent, no qualification, other | 2011 Census |
| Disability | Non-disabled, disabled (limited a little), disabled (limited a lot) | 2011 Census |
| Body mass index (kg/m2) | <18.5, 18.5–25, 25–30, ≥30, missing | GPES |
| Chronic kidney disease (CKD) | No CKD, CKD3, CKD4, CKD5 | GPES |
| Learning disability | No learning disability, Down’s syndrome, other learning disability | GPES |
| Cancer and immunosuppression | Dummies for blood cancer, solid organ transplant, prescribed immunosuppressant medication by GP, prescribed leukotriene or long-acting beta blockers, prescribed regular prednisolone | GPES |
| Other conditions | Diabetes, chronic obstructive pulmonary disease, asthma, rare pulmonary diseases, pulmonary hypertension or pulmonary fibrosis, coronary heart disease, stroke, atrial fibrillation, congestive cardiac failure, venous thromboembolism, peripheral vascular disease, congenital heart disease, dementia, Parkinson’s disease, epilepsy, rare neurological conditions, cerebral palsy, severe mental illness (bipolar disorder, schizophrenia, severe depression), osteoporotic fracture, rheumatoid arthritis or systemic lupus erythematosus, cirrhosis of the liver | GPES/HES |
GCSE, General Certificate of Secondary Education; GP, general practitioner; GPES, General Practice Extraction Service; HES, Hospital Episode Statistics; NHS, National Health Service; NIMS, National Immunisation Management System.