Data
84,345 items of data are available, covering 79,574 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 | 21.7015 |
| Decile 9 | 5.33491 |
| Decile 8 | 3.80922 |
| Decile 7 | 2.78925 |
| Decile 6 | 1.94438 |
| Median | 1.20621 |
| Decile 4 | 0.393477 |
| Decile 3 | -0.49849 |
| Decile 2 | -1.45612 |
| Decile 1 | -2.76858 |
| Minimum | -44.7693 |
|
|
- Mean = 1.14372
- Std.dev = 3.7366
- 269 items below graph minimum of -10.8721
- 68 items above graph maximum of 13.4384
|
2 Instances
Instance 2 : Imaging visit (2014+)
79,564 participants, 79,564 items
| Maximum | 21.7015 |
| Decile 9 | 5.34845 |
| Decile 8 | 3.81274 |
| Decile 7 | 2.79291 |
| Decile 6 | 1.95155 |
| Median | 1.21721 |
| Decile 4 | 0.3988 |
| Decile 3 | -0.500468 |
| Decile 2 | -1.46291 |
| Decile 1 | -2.76958 |
| Minimum | -44.7693 |
|
|
- Mean = 1.14691
- Std.dev = 3.74031
- 253 items below graph minimum of -10.8876
- 59 items above graph maximum of 13.4665
|
Instance 3 : First repeat imaging visit (2019+)
4,781 participants, 4,781 items
| Maximum | 18.9082 |
| Decile 9 | 5.13153 |
| Decile 8 | 3.72678 |
| Decile 7 | 2.74668 |
| Decile 6 | 1.81027 |
| Median | 1.0363 |
| Decile 4 | 0.32629 |
| Decile 3 | -0.47842 |
| Decile 2 | -1.32025 |
| Decile 1 | -2.7475 |
| Minimum | -43.9158 |
|
|
- Mean = 1.09063
- Std.dev = 3.67394
- 16 items below graph minimum of -10.6265
- 8 items above graph maximum of 13.0106
|
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 lateral brain position is the X-co-ordinate (left-right) of the centre 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 |
|---|
| 25758 | Scanner longitudinal (Z) brain position | Field 25758 is the longitudinal partner of lateral Current Field |
| 25757 | Scanner transverse (Y) brain position | Current Field is the lateral partner of transverse Field 25757 |
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