Table 1

Variables used in the analyses

VariableCodingSource
VaccinatedReceived a first dose of a COVID-19 vaccine by 15 March 2020NIMS
AgeThird-order polynomial2011 Census
SexFemale, male2011 Census
EthnicityWhite British, Bangladeshi, Black African, Black Caribbean, Chinese, Indian, Mixed, Other, Pakistani, White other2011 Census
Religious affiliationChristian, Buddhist, Hindu, Jewish, Muslim, no religion, other religion, religion not stated, Sikh2011 Census
RegionDummy variables representing region of residence2019 NHS Patient Register
Rural–urban classificationUrban, rural2019 NHS Patient Register
Index of Multiple DeprivationDummy variables representing quintiles of deprivation2019 NHS Patient Register
Household tenureOwn, social rented, private rented, other2011 Census
Level of highest qualificationDegree, A-level or equivalent, GCSE or equivalent, no qualification, other2011 Census
DisabilityNon-disabled, disabled (limited a little), disabled (limited a lot)2011 Census
Body mass index (kg/m2)<18.5, 18.5–25, 25–30, ≥30, missingGPES
Chronic kidney disease (CKD)No CKD, CKD3, CKD4, CKD5GPES
Learning disabilityNo learning disability, Down’s syndrome, other learning disabilityGPES
Cancer and immunosuppressionDummies for blood cancer, solid organ transplant, prescribed immunosuppressant medication by GP, prescribed leukotriene or long-acting beta blockers, prescribed regular prednisoloneGPES
Other conditionsDiabetes, 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 liverGPES/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.