Data
3,491,976 items of data are available, covering 498,011 participants.
Some values have special meanings defined by Data-Coding
439.
Defined-instances run from 0 to 3, labelled using Instancing
2.
Array indices run from 0 to 6.
| Maximum | 2022-05-20 |
| Decile 9 | 2010-07-19 |
| Decile 8 | 2010-03-31 |
| Decile 7 | 2009-11-17 |
| Decile 6 | 2009-07-27 |
| Median | 2009-03-26 |
| Decile 4 | 2008-11-25 |
| Decile 3 | 2008-08-11 |
| Decile 2 | 2008-04-19 |
| Decile 1 | 2007-12-10 |
| Minimum | 1900-01-01 |
|
|
- Mean = 2007-09-16
- 66506 items below graph minimum of 2005-05-03
- 257624 items above graph maximum of 2013-02-25
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
497,702 participants, 3,082,697 items
| Maximum | 2010-10-01 |
| Decile 9 | 2010-04-23 |
| Decile 8 | 2009-12-15 |
| Decile 7 | 2009-09-09 |
| Decile 6 | 2009-05-29 |
| Median | 2009-02-15 |
| Decile 4 | 2008-10-28 |
| Decile 3 | 2008-07-24 |
| Decile 2 | 2008-04-16 |
| Decile 1 | 2007-12-20 |
| Minimum | 2006-03-13 |
|
| |
Instance 1 : First repeat assessment visit (2012-13)
20,237 participants, 141,107 items
| Maximum | 2013-06-08 |
| Decile 9 | 2013-05-15 |
| Decile 8 | 2013-04-22 |
| Decile 7 | 2013-03-24 |
| Decile 6 | 2013-02-25 |
| Median | 2013-01-28 |
| Decile 4 | 2012-12-15 |
| Decile 3 | 2012-11-16 |
| Decile 2 | 2012-10-18 |
| Decile 1 | 2012-09-18 |
| Minimum | 2012-08-01 |
|
| |
Instance 2 : Imaging visit (2014+)
53,052 participants, 247,236 items
| Maximum | 2022-05-20 |
| Decile 9 | 2019-11-13 |
| Decile 8 | 2019-04-03 |
| Decile 7 | 2018-08-26 |
| Decile 6 | 2017-10-27 |
| Median | 2016-09-05 |
| Decile 4 | 2015-08-19 |
| Decile 3 | 2014-12-01 |
| Decile 2 | 1900-01-01 |
| Decile 1 | 1900-01-01 |
| Minimum | 1900-01-01 |
|
| |
Instance 3 : First repeat imaging visit (2019+)
5,234 participants, 20,936 items
| Maximum | 2022-03-10 |
| Decile 9 | 2021-08-11 |
| Decile 8 | 2021-06-08 |
| Decile 7 | 2021-03-29 |
| Decile 6 | 2020-02-21 |
| Median | 2019-12-07 |
| Decile 4 | 2019-10-19 |
| Decile 3 | 2019-08-27 |
| Decile 2 | 1900-01-01 |
| Decile 1 | 1900-01-01 |
| Minimum | 1900-01-01 |
|
| |
Notes
This is the time when each blood sample was recorded on the computerised system by swiping the unique barcode on the collection tube. Generally it is a few seconds after the sample is actually extracted.
In about 36,000 cases a clock error on the collection system resulted in incorrect extraction times being saved. These values have been removed from the database.
