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317,752 items of data are available, covering 317,752 participants, encoded using Data-Coding 1007
This field indicates how many participants have access to email as deduced from their supplying an email address to UK Biobank.
A participant is flagged as having an Unusable address if any of the following are true:
- The email address held is syntactically incorrect.
- A bounce-back failure message was received during a newsletter or other mailing to the address from UK Biobank.
- The participant has asked for their email address to be withdrawn or deleted.
Note that the actual email addresses are treated with utmost confidentiality by UK Biobank and will not be made available to researchers.
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