Data
87,996 items of data are available, covering 83,313 participants.
Defined-instances run from 2 to 3, labelled using Instancing 
2.
Units of measurement are AU.
| Maximum | 38.469 |  
| Decile 9 | 25.5519 |  
| Decile 8 | 24.6257 |  
| Decile 7 | 23.9733 |  
| Decile 6 | 23.4283 |  
| Median | 22.9317 |  
| Decile 4 | 22.4427 |  
| Decile 3 | 21.9165 |  
| Decile 2 | 21.3132 |  
| Decile 1 | 20.4722 |  
| Minimum | 6.5515 |  
 
 | 
 
 | 
- Mean = 22.9817
 
- Std.dev = 2.01828
 
- 20 items below graph minimum of 15.3925
 
- 55 items above graph maximum of 30.6316
 
  | 
 
2 Instances
Instance 2 : Imaging visit (2014+)
83,241 participants, 83,241 items
| Maximum | 38.469 |  
| Decile 9 | 25.5573 |  
| Decile 8 | 24.6265 |  
| Decile 7 | 23.9751 |  
| Decile 6 | 23.4273 |  
| Median | 22.9304 |  
| Decile 4 | 22.4408 |  
| Decile 3 | 21.9134 |  
| Decile 2 | 21.3083 |  
| Decile 1 | 20.4663 |  
| Minimum | 6.5515 |  
 
 | 
 
 | 
- Mean = 22.9801
 
- Std.dev = 2.02275
 
- 18 items below graph minimum of 15.3754
 
- 54 items above graph maximum of 30.6483
 
  | 
Instance 3 : First repeat imaging visit (2019+)
4,755 participants, 4,755 items
| Maximum | 30.8025 |  
| Decile 9 | 25.4726 |  
| Decile 8 | 24.6085 |  
| Decile 7 | 23.9488 |  
| Decile 6 | 23.4522 |  
| Median | 22.9616 |  
| Decile 4 | 22.4802 |  
| Decile 3 | 21.9685 |  
| Decile 2 | 21.3856 |  
| Decile 1 | 20.577 |  
| Minimum | 14.9631 |  
 
 | 
 
 | 
- Mean = 23.0095
 
- Std.dev = 1.93809
 
- 2 items below graph minimum of 15.6815
 
- 1 item above graph maximum of 30.3681
 
  | 
 
Notes
Grey-white contrast in pericalcarine in the left hemisphere calculated as a percentage of the mean gray-white matter intensity from Desikan-Killiany parcellation
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