Data
306,365 items of data are available, covering 243,183 participants, encoded using Data-Coding 
16.
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
171,365 participants, 171,365 items
 
Instance 1 : First repeat assessment visit (2012-13)
20,309 participants, 20,309 items
 
Instance 2 : Imaging visit (2014+)
94,752 participants, 94,752 items
 
Instance 3 : First repeat imaging visit (2019+)
19,939 participants, 19,939 items
