Data
526,966 items of data are available, covering 462,453 participants, encoded using Data-Coding 
7.
Defined-instances run from 0 to 3, labelled using Instancing 
2.
 
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
459,482 participants, 459,482 items
 
Instance 1 : First repeat assessment visit (2012-13)
18,114 participants, 18,114 items
 
Instance 2 : Imaging visit (2014+)
45,589 participants, 45,589 items
 
Instance 3 : First repeat imaging visit (2019+)
3,781 participants, 3,781 items
