Data
3,535,084 items of data are available, covering 499,785 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 | 2022-07-13 |
| Decile 9 | 2010-07-20 |
| Decile 8 | 2010-03-30 |
| Decile 7 | 2009-11-15 |
| Decile 6 | 2009-07-23 |
| Median | 2009-03-21 |
| Decile 4 | 2008-11-19 |
| Decile 3 | 2008-08-02 |
| Decile 2 | 2008-04-12 |
| Decile 1 | 2007-11-24 |
| Minimum | 1900-01-01 |
|
|
- Mean = 2006-08-12
- 103228 items below graph minimum of 2005-03-30
- 253250 items above graph maximum of 2013-03-16
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
499,612 participants, 3,117,952 items
| Maximum | 2010-10-01 |
| Decile 9 | 2010-04-22 |
| Decile 8 | 2009-12-12 |
| Decile 7 | 2009-09-05 |
| Decile 6 | 2009-05-22 |
| Median | 2009-02-11 |
| Decile 4 | 2008-10-21 |
| Decile 3 | 2008-07-16 |
| Decile 2 | 2008-04-09 |
| Decile 1 | 2007-12-07 |
| Minimum | 1900-01-01 |
|
|
- Mean = 2007-11-24
- 34561 items below graph minimum of 2005-07-24
|
Instance 1 : First repeat assessment visit (2012-13)
20,272 participants, 141,904 items
| Maximum | 2013-06-08 |
| Decile 9 | 2013-05-15 |
| Decile 8 | 2013-04-22 |
| Decile 7 | 2013-03-23 |
| Decile 6 | 2013-02-24 |
| Median | 2013-01-27 |
| Decile 4 | 2012-12-14 |
| Decile 3 | 2012-11-15 |
| Decile 2 | 2012-10-16 |
| Decile 1 | 2012-09-16 |
| Minimum | 1900-01-01 |
|
|
- Mean = 2012-05-31
- 797 items below graph minimum of 2012-01-20
|
Instance 2 : Imaging visit (2014+)
54,816 participants, 254,292 items
| Maximum | 2022-07-13 |
| Decile 9 | 2020-01-16 |
| Decile 8 | 2019-05-07 |
| Decile 7 | 2018-09-24 |
| Decile 6 | 2017-12-01 |
| Median | 2016-10-19 |
| Decile 4 | 2015-09-05 |
| Decile 3 | 2014-12-09 |
| 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.
