Data
3,468,470 items of data are available, covering 498,033 participants.
Defined-instances run from 0 to 3, labelled using Instancing
2.
Array indices run from 0 to 6.
| Maximum | 2021-07-23 |
| Decile 9 | 2010-07-08 |
| Decile 8 | 2010-03-27 |
| Decile 7 | 2009-11-14 |
| Decile 6 | 2009-07-24 |
| Median | 2009-03-24 |
| Decile 4 | 2008-11-24 |
| Decile 3 | 2008-08-11 |
| Decile 2 | 2008-04-21 |
| Decile 1 | 2007-12-11 |
| Minimum | 1900-01-01 |
|
|
- Mean = 2007-10-31
- 60192 items below graph minimum of 2005-05-16
- 251699 items above graph maximum of 2013-02-02
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
497,751 participants, 3,082,996 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)
20,238 participants, 141,114 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+)
47,891 participants, 226,592 items
| Maximum | 2020-03-13 |
| Decile 9 | 2019-07-06 |
| Decile 8 | 2019-01-02 |
| Decile 7 | 2018-06-02 |
| Decile 6 | 2017-08-06 |
| Median | 2016-06-07 |
| Decile 4 | 2015-07-30 |
| Decile 3 | 2014-11-29 |
| Decile 2 | 1900-01-01 |
| Decile 1 | 1900-01-01 |
| Minimum | 1900-01-01 |
|
|
- Mean = 1988-04-13
- 1 item above graph maximum of 2020-03-13
|
Instance 3 : First repeat imaging visit (2019+)
4,442 participants, 17,768 items
| Maximum | 2021-07-23 |
| Decile 9 | 2021-05-22 |
| Decile 8 | 2021-03-26 |
| Decile 7 | 2020-02-28 |
| Decile 6 | 2020-01-02 |
| Median | 2019-11-11 |
| Decile 4 | 2019-09-28 |
| Decile 3 | 2019-08-09 |
| 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.
