: Data-Coding 1273

Data-Coding 1273

Name: Date conditions

Description: Special date values indicating data problems.

This is a flat (unstructured) list which uses dates to represent categories or special values.

Coding can be downloaded here as a tab-separated file.

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2 Entries

Coding	Meaning
1900-01-01	Date is unknown
1999-01-01	Date is invalid

9 Data-Fields

Field ID	Description	Category
27993	Date antibody test kit despatched	Coronavirus infection study
27982	Date antibody test performed	Self-test antibody study
28009	Date antibody test sample was received by UK Biobank	Waves 1-6 sample processing
27984	Date of first COVID-19 vaccination	Self-test antibody study
27986	Date of second COVID-19 vaccination	Self-test antibody study
28032	Date questionnaire results were received by post	Waves 1-6 symptoms questionnaire
28031	Self-reported date of a positive COVID-19 test result	Waves 1-6 symptoms questionnaire
28030	Self-reported date symptoms first experienced	Waves 1-6 symptoms questionnaire
28008	Self-reported date that antibody test sample was collected	Waves 1-6 sample processing

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