Data
774,829 items of data are available, covering 502,450 participants.
Some values have special meanings defined by Data-Coding
1313.
Array indices run from 0 to 14.
| Maximum | 2017-01-09 |
| Decile 9 | 2012-06-11 |
| Decile 8 | 2009-07-02 |
| Decile 7 | 2007-05-29 |
| Decile 6 | 2005-01-11 |
| Median | 2002-04-01 |
| Decile 4 | 1999-06-06 |
| Decile 3 | 1997-02-06 |
| Decile 2 | 1993-10-12 |
| Decile 1 | 1988-05-06 |
| Minimum | 1939-01-05 |
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- There are 11903 distinct values.
- Mean = 2000-10-19
- 7398 items below graph minimum of 1964-03-31
- 2390 items have value 1904-04-04 (Date in or before calendar year of birth)
|
Notes
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.
Coding 1313 defines 1 special value:
- 1904-04-04 represents "Date in or before calendar year of birth"
