Data
87,540 items of data are available, covering 82,780 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 | 124.458 |
| Decile 9 | 3.06887 |
| Decile 8 | -21.4867 |
| Decile 7 | -27.3022 |
| Decile 6 | -31.504 |
| Median | -35.2127 |
| Decile 4 | -38.9034 |
| Decile 3 | -42.8249 |
| Decile 2 | -47.6128 |
| Decile 1 | -54.5112 |
| Minimum | -113.271 |
|
|
- Mean = -31.3583
- Std.dev = 23.2139
- 2 items below graph minimum of -112.091
- 245 items above graph maximum of 60.6489
|
2 Instances
Instance 2 : Imaging visit (2014+)
82,769 participants, 82,769 items
| Maximum | 124.458 |
| Decile 9 | 4.77454 |
| Decile 8 | -20.8247 |
| Decile 7 | -26.9509 |
| Decile 6 | -31.2254 |
| Median | -34.9594 |
| Decile 4 | -38.6665 |
| Decile 3 | -42.5777 |
| Decile 2 | -47.3642 |
| Decile 1 | -54.2906 |
| Minimum | -113.271 |
|
|
- Mean = -30.8824
- Std.dev = 23.5229
- 197 items above graph maximum of 63.8397
|
Instance 3 : First repeat imaging visit (2019+)
4,771 participants, 4,771 items
| Maximum | 71.4206 |
| Decile 9 | -23.836 |
| Decile 8 | -28.7739 |
| Decile 7 | -32.553 |
| Decile 6 | -35.7076 |
| Median | -39.1083 |
| Decile 4 | -42.6639 |
| Decile 3 | -46.5494 |
| Decile 2 | -51.0903 |
| Decile 1 | -57.5643 |
| Minimum | -101.276 |
|
|
- Mean = -39.6136
- Std.dev = 14.7047
- 2 items below graph minimum of -91.2927
- 50 items above graph maximum of 9.89239
|
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 longitudinal brain position is the Z-co-ordinate of the centre of the brain mask within the scanner. The Z axis points down the centre of the magnet.
Coding 1317 defines 1 special value:
- -999999 represents "Measure not cleanly recoverable from data"
3 Related Data-Fields
| Field ID | Description | Relationship |
|---|
| 25756 | Scanner lateral (X) brain position | Current Field is the longitudinal partner of lateral Field 25756 |
| 25759 | Scanner table position | Field 25759 is the table position used to measure longitudinal Current Field |
| 25757 | Scanner transverse (Y) brain position | Field 25757 is the transverse partner of longitudinal Current Field |
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