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202,587 items of data are available, covering 201,890 participants, encoded using Data-Coding 603. Defined-instances run from 0 to 1, labelled using Instancing 154.
Instance 0 : First COVID-19 antibody test taken, Feb 2021 to July 2021
201,890 participants, 201,890 items
Instance 1 : Repeat COVID-19 antibody test taken, March 2021 to July 2021
697 participants, 697 items
Participants self-reported the result of their COVID-19 antibody self-testing device, either by submitting it online via their UK Biobank participant account, using a paper questionnaire returned to UK Biobank in the mail or via phone to the UK Biobank Participant Resource Centre. Fortress kits from Phase 1 produced results that differentiated between IgG antibodies (long-term) and IgM antibodies (short-term). AbC-19TM kits from Phase 2 provided test results for IgG antibodies only.