Data
624,812 items of data are available, covering 501,937 participants.
Defined-instances run from 0 to 3, labelled using Instancing 
2.
| 
| Maximum | 2025-08-30 |  | Decile 9 | 2022-06-16 |  | Decile 8 | 2010-07-10 |  | Decile 7 | 2010-03-05 |  | Decile 6 | 2009-10-03 |  | Median | 2009-05-27 |  | Decile 4 | 2009-01-24 |  | Decile 3 | 2008-09-18 |  | Decile 2 | 2008-05-21 |  | Decile 1 | 2008-01-26 |  | Minimum | 2005-02-11 |  |   |  | 
3 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
501,935 participants, 501,935 items
| 
| Maximum | 2010-10-01 |  | Decile 9 | 2010-04-07 |  | Decile 8 | 2009-11-22 |  | Decile 7 | 2009-08-12 |  | Decile 6 | 2009-05-01 |  | Median | 2009-01-26 |  | Decile 4 | 2008-10-11 |  | Decile 3 | 2008-07-12 |  | Decile 2 | 2008-04-09 |  | Decile 1 | 2007-12-14 |  | Minimum | 2005-02-11 |  |   | 
Mean = 2009-01-2315 items below graph minimum of 2005-08-21 | 
Instance 2 : Imaging visit (2014+)
101,813 participants, 101,813 items
| 
| Maximum | 2025-08-30 |  | Decile 9 | 2024-10-16 |  | Decile 8 | 2024-01-23 |  | Decile 7 | 2023-07-04 |  | Decile 6 | 2022-11-22 |  | Median | 2022-01-16 |  | Decile 4 | 2019-07-02 |  | Decile 3 | 2018-10-22 |  | Decile 2 | 2017-12-01 |  | Decile 1 | 2016-07-17 |  | Minimum | 2013-08-12 |  |   |  | 
Instance 3 : First repeat imaging visit (2019+)
21,064 participants, 21,064 items
| 
| Maximum | 2025-08-30 |  | Decile 9 | 2025-05-31 |  | Decile 8 | 2025-03-08 |  | Decile 7 | 2024-12-01 |  | Decile 6 | 2024-09-12 |  | Median | 2024-06-23 |  | Decile 4 | 2024-03-10 |  | Decile 3 | 2023-07-16 |  | Decile 2 | 2021-06-17 |  | Decile 1 | 2019-12-03 |  | Minimum | 2018-06-30 |  |   |  | 
Notes
Time when a UK Biobank staff member signed off a stage as having been completed correctly.
1 Related Data-Field
| Field ID | Description | Relationship | 
|---|
| 21721 | Consent authorisation | Field 21721 indicates the staff member who signed-off at time Current Field | 
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