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774,757 items of data are available, covering 502,409 participants. Some values have special meanings defined by Data-Coding 1313. Array indices run from 0 to 14.
There are 11903 distinct values.
Mean = 2000-10-18
7398 items below graph minimum of 1964-03-31
2389 items have value 1904-04-04 (Date in or before calendar year of birth)
Counts of participants/items last updated 23 Oct 2021.
This the date at which a participant is first recorded (according to the record sources available to UK Biobank) at the location given in Field 22702 and Field 22704 (or the more precise, but restricted, Field 22701 and Field 22703).
Note that, when data is supplied to approved researchers, the array index of dates will not necessarily be in the same order as the dates themselves as UK Biobank does not itself receive location data in chronological order.