Data
7,561,464 items of data are available, covering 496,387 participants, encoded using Data-Coding 
92.
Defined-instances run from 0 to 3, labelled using Instancing 
2.
Array indices run from 0 to 11.
| Category | Count | 
| Equals-sign "=" | 945019 | 
| Fir-tree (3 overlapping triangles) | 944864 | 
| Hollow circle | 314999 | 
| Hollow square | 315649 | 
| Rugby-post "H" | 945740 | 
| Smiley face | 945975 | 
| Solid circle | 945750 | 
| Heart | 0 | 
| Diamond | 0 | 
| Four squares | 0 | 
| Lightning bolt | 0 | 
| Top-hat | 0 | 
| Linked squares | 0 | 
| Diagonal cross | 0 | 
| Crescent | 0 | 
| Sitting cat | 0 | 
| Bow tie | 0 | 
| House | 0 | 
| Horse-shoe "U" | 0 | 
| Star | 0 | 
| Person | 0 | 
| Knife and fork | 0 | 
| Solid square | 945009 | 
| Triangle | 314233 | 
| Vertical/horizontal cross "+" | 944226 | 
 
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
495,122 participants, 5,941,464 items
| Category | Count | 
| Equals-sign "=" | 742799 | 
| Fir-tree (3 overlapping triangles) | 742460 | 
| Hollow circle | 247532 | 
| Hollow square | 248016 | 
| Rugby-post "H" | 742960 | 
| Smiley face | 743187 | 
| Solid circle | 743115 | 
| Heart | 0 | 
| Diamond | 0 | 
| Four squares | 0 | 
| Lightning bolt | 0 | 
| Top-hat | 0 | 
| Linked squares | 0 | 
| Diagonal cross | 0 | 
| Crescent | 0 | 
| Sitting cat | 0 | 
| Bow tie | 0 | 
| House | 0 | 
| Horse-shoe "U" | 0 | 
| Star | 0 | 
| Person | 0 | 
| Knife and fork | 0 | 
| Solid square | 742792 | 
| Triangle | 247091 | 
| Vertical/horizontal cross "+" | 741512 | 
Instance 1 : First repeat assessment visit (2012-13)
20,309 participants, 243,708 items
| Category | Count | 
| Equals-sign "=" | 30371 | 
| Fir-tree (3 overlapping triangles) | 30429 | 
| Hollow circle | 10299 | 
| Hollow square | 10189 | 
| Rugby-post "H" | 30578 | 
| Smiley face | 30454 | 
| Solid circle | 30367 | 
| Heart | 0 | 
| Diamond | 0 | 
| Four squares | 0 | 
| Lightning bolt | 0 | 
| Top-hat | 0 | 
| Linked squares | 0 | 
| Diagonal cross | 0 | 
| Crescent | 0 | 
| Sitting cat | 0 | 
| Bow tie | 0 | 
| House | 0 | 
| Horse-shoe "U" | 0 | 
| Star | 0 | 
| Person | 0 | 
| Knife and fork | 0 | 
| Solid square | 30512 | 
| Triangle | 10082 | 
| Vertical/horizontal cross "+" | 30427 | 
Instance 2 : Imaging visit (2014+)
94,752 participants, 1,137,024 items
| Category | Count | 
| Equals-sign "=" | 142213 | 
| Fir-tree (3 overlapping triangles) | 141999 | 
| Hollow circle | 47308 | 
| Hollow square | 47288 | 
| Rugby-post "H" | 142098 | 
| Smiley face | 142280 | 
| Solid circle | 142397 | 
| Heart | 0 | 
| Diamond | 0 | 
| Four squares | 0 | 
| Lightning bolt | 0 | 
| Top-hat | 0 | 
| Linked squares | 0 | 
| Diagonal cross | 0 | 
| Crescent | 0 | 
| Sitting cat | 0 | 
| Bow tie | 0 | 
| House | 0 | 
| Horse-shoe "U" | 0 | 
| Star | 0 | 
| Person | 0 | 
| Knife and fork | 0 | 
| Solid square | 141910 | 
| Triangle | 47093 | 
| Vertical/horizontal cross "+" | 142438 | 
Instance 3 : First repeat imaging visit (2019+)
19,939 participants, 239,268 items
| Category | Count | 
| Equals-sign "=" | 29636 | 
| Fir-tree (3 overlapping triangles) | 29976 | 
| Hollow circle | 9860 | 
| Hollow square | 10156 | 
| Rugby-post "H" | 30104 | 
| Smiley face | 30054 | 
| Solid circle | 29871 | 
| Heart | 0 | 
| Diamond | 0 | 
| Four squares | 0 | 
| Lightning bolt | 0 | 
| Top-hat | 0 | 
| Linked squares | 0 | 
| Diagonal cross | 0 | 
| Crescent | 0 | 
| Sitting cat | 0 | 
| Bow tie | 0 | 
| House | 0 | 
| Horse-shoe "U" | 0 | 
| Star | 0 | 
| Person | 0 | 
| Knife and fork | 0 | 
| Solid square | 29795 | 
| Triangle | 9967 | 
| Vertical/horizontal cross "+" | 29849 |