Data
3,698,988 items of data are available, covering 499,606 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 | 2024-09-15 |
| Decile 9 | 2013-04-30 |
| Decile 8 | 2010-05-13 |
| Decile 7 | 2010-01-09 |
| Decile 6 | 2009-09-01 |
| Median | 2009-05-01 |
| Decile 4 | 2009-01-07 |
| Decile 3 | 2008-09-06 |
| Decile 2 | 2008-05-14 |
| Decile 1 | 2008-01-23 |
| Minimum | 2006-03-13 |
|
|
- Mean = 2010-04-22
- 224022 items above graph maximum of 2018-08-05
- 143579 items have value 1900-01-01 (Not performed)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
499,355 participants, 3,081,803 items
| Maximum | 2010-10-01 |
| Decile 9 | 2010-04-23 |
| Decile 8 | 2009-12-15 |
| Decile 7 | 2009-09-09 |
| Decile 6 | 2009-05-28 |
| Median | 2009-02-15 |
| Decile 4 | 2008-10-27 |
| Decile 3 | 2008-07-24 |
| Decile 2 | 2008-04-16 |
| Decile 1 | 2007-12-20 |
| Minimum | 2006-03-13 |
|
|
- Mean = 2009-02-08
- 34543 items have value 1900-01-01 (Not performed)
|
Instance 1 : First repeat assessment visit (2012-13)
20,266 participants, 141,065 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 |
|
|
- Mean = 2013-01-19
- 797 items have value 1900-01-01 (Not performed)
|
Instance 2 : Imaging visit (2014+)
88,913 participants, 294,317 items
| Maximum | 2024-09-15 |
| Decile 9 | 2024-01-04 |
| Decile 8 | 2023-06-12 |
| Decile 7 | 2022-11-06 |
| Decile 6 | 2022-02-02 |
| Median | 2019-07-02 |
| Decile 4 | 2018-10-22 |
| Decile 3 | 2017-11-23 |
| Decile 2 | 2016-07-17 |
| Decile 1 | 2015-06-17 |
| Minimum | 2014-04-30 |
|
|
- Mean = 2019-12-24
- 96351 items have value 1900-01-01 (Not performed)
|
Instance 3 : First repeat imaging visit (2019+)
12,528 participants, 38,224 items
| Maximum | 2024-09-15 |
| Decile 9 | 2024-07-28 |
| Decile 8 | 2024-06-03 |
| Decile 7 | 2024-04-04 |
| Decile 6 | 2023-12-05 |
| Median | 2023-06-25 |
| Decile 4 | 2021-08-27 |
| Decile 3 | 2021-04-30 |
| Decile 2 | 2020-02-03 |
| Decile 1 | 2019-10-11 |
| Minimum | 2019-05-22 |
|
|
- Mean = 2022-08-02
- 11888 items have value 1900-01-01 (Not performed)
|
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.
