Help : Data Coding

A large proportion of the data data-fields within the UK Biobank repository are categorical. A data-coding is a mapping between the actual data and the values used to represent it within the database - for example the value "44" may be stored to represent "Born in Great Britain", with "33" representing "Born in France".

There are two structures

Apart from their use in interpreting the values of a data-field, a data-coding also shows the range of answers/alternatives that were available when an item of data was entered - the data-coding may include alternatives that do not appear in the final dataset because they were not applicable to any participants in UK Biobank.

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