Data
68,430 items of data are available, covering 63,657 participants.
Some values have special meanings defined by Data-Coding
1317.
Defined-instances run from 2 to 3, labelled using Instancing
2.
Units of measurement are Units.
| Maximum | 103 |
| Decile 9 | 75 |
| Decile 8 | 73 |
| Decile 7 | 71 |
| Decile 6 | 69 |
| Median | 67 |
| Decile 4 | 65 |
| Decile 3 | 63 |
| Decile 2 | 61 |
| Decile 1 | 60 |
| Minimum | 52 |
|
|
- Mean = 67.3404
- Std.dev = 6.13395
- 42 items above graph maximum of 90
|
2 Instances
Instance 2 : Imaging visit (2014+)
63,647 participants, 63,647 items
| Maximum | 103 |
| Decile 9 | 75 |
| Decile 8 | 73 |
| Decile 7 | 71 |
| Decile 6 | 69 |
| Median | 67 |
| Decile 4 | 65 |
| Decile 3 | 63 |
| Decile 2 | 61 |
| Decile 1 | 59 |
| Minimum | 52 |
|
|
- Mean = 67.2012
- Std.dev = 6.16736
- 32 items above graph maximum of 91
|
Instance 3 : First repeat imaging visit (2019+)
4,783 participants, 4,783 items
| Maximum | 93 |
| Decile 9 | 76 |
| Decile 8 | 74 |
| Decile 7 | 72 |
| Decile 6 | 71 |
| Median | 69 |
| Decile 4 | 68 |
| Decile 3 | 66 |
| Decile 2 | 64 |
| Decile 1 | 62 |
| Minimum | 53 |
|
|
- Mean = 69.1928
- Std.dev = 5.33542
- 2 items above graph maximum of 90
|
Notes
The exact location of the head and the radio-frequency receive coil in the scanner can affect data quality and imaging-derived phenotypes. To help account for variations in position in different scanned participants, several variables have been generated which describe aspects of the positioning and can be used as "confounding variables" - for example they might be regressed out of brain phenotypes before carrying out correlations between these and non-imaging variables.
The transverse brain position is the Y-co-ordinate (front-back relative to head) of the back of the brain mask within the scanner.
Coding 1317 defines 1 special value:
- -999999 represents "Measure not cleanly recoverable from data"
2 Related Data-Fields
| Field ID | Description | Relationship |
|---|
| 25756 | Scanner lateral (X) brain position | Field 25756 is the lateral partner of transverse Current Field |
| 25758 | Scanner longitudinal (Z) brain position | Current Field is the transverse partner of longitudinal Field 25758 |
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