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 | 32.4252 |  | Decile 9 | 28.358 |  | Decile 8 | 27.6397 |  | Decile 7 | 27.1234 |  | Decile 6 | 26.663 |  | Median | 26.2203 |  | Decile 4 | 25.7683 |  | Decile 3 | 25.2597 |  | Decile 2 | 24.6463 |  | Decile 1 | 23.7496 |  | Minimum | 16.3416 |  |   | 
Mean = 26.1204Std.dev = 1.8210163 items below graph minimum of 19.1412 | 
2 Instances
Instance 2 : Imaging visit (2014+)
83,241 participants, 83,241 items
| 
| Maximum | 32.4252 |  | Decile 9 | 28.3601 |  | Decile 8 | 27.6386 |  | Decile 7 | 27.1187 |  | Decile 6 | 26.6539 |  | Median | 26.2097 |  | Decile 4 | 25.7563 |  | Decile 3 | 25.2446 |  | Decile 2 | 24.6315 |  | Decile 1 | 23.736 |  | Minimum | 16.3416 |  |   | 
Mean = 26.1119Std.dev = 1.8279260 items below graph minimum of 19.112 | 
Instance 3 : First repeat imaging visit (2019+)
4,755 participants, 4,755 items
| 
| Maximum | 31.5896 |  | Decile 9 | 28.3119 |  | Decile 8 | 27.6704 |  | Decile 7 | 27.2077 |  | Decile 6 | 26.7843 |  | Median | 26.388 |  | Decile 4 | 25.9805 |  | Decile 3 | 25.4952 |  | Decile 2 | 24.9353 |  | Decile 1 | 24.1042 |  | Minimum | 16.9533 |  |   | 
Mean = 26.2704Std.dev = 1.688364 items below graph minimum of 19.8965 | 
Notes
Grey-white contrast in precuneus in the right hemisphere calculated as a percentage of the mean gray-white matter intensity from Desikan-Killiany parcellation
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