Data
1,078,472 items of data are available, covering 403,756 participants.
Some values have special meanings defined by Data-Coding
13.
Defined-instances run from 0 to 3, labelled using Instancing
2.
Array indices run from 0 to 31.
Units of measurement are years.
Maximum | 91.5 |
Decile 9 | 60.4 |
Decile 8 | 54.2 |
Decile 7 | 48.5 |
Decile 6 | 43 |
Median | 37.8 |
Decile 4 | 32.3 |
Decile 3 | 25.9 |
Decile 2 | 17.8 |
Decile 1 | 8.5 |
Minimum | 0 |
|
|
- Mean = 36.4417
- Std.dev = 18.4441
- 57 items have value -3 (Preferred not to answer)
- 12641 items have value -1 (Date uncertain or unknown)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
391,007 participants, 859,040 items
Maximum | 91.5 |
Decile 9 | 58.7 |
Decile 8 | 52.5 |
Decile 7 | 47.2 |
Decile 6 | 41.9 |
Median | 36.8 |
Decile 4 | 31.5 |
Decile 3 | 25.5 |
Decile 2 | 17.5 |
Decile 1 | 8.5 |
Minimum | 0 |
|
|
- Mean = 35.4617
- Std.dev = 17.7674
- 53 items have value -3 (Preferred not to answer)
- 8546 items have value -1 (Date uncertain or unknown)
|
Instance 1 : First repeat assessment visit (2012-13)
16,268 participants, 35,170 items
Maximum | 75.2 |
Decile 9 | 62.9 |
Decile 8 | 57.3 |
Decile 7 | 51.5 |
Decile 6 | 46.1 |
Median | 40.3 |
Decile 4 | 34.1 |
Decile 3 | 27.1 |
Decile 2 | 17.7 |
Decile 1 | 7.5 |
Minimum | 0 |
|
|
- Mean = 38.0718
- Std.dev = 19.5346
- 1 items have value -3 (Preferred not to answer)
- 102 items have value -1 (Date uncertain or unknown)
|
Instance 2 : Imaging visit (2014+)
63,008 participants, 155,969 items
Maximum | 85.2 |
Decile 9 | 67.4 |
Decile 8 | 60.8 |
Decile 7 | 55.4 |
Decile 6 | 49.5 |
Median | 42.8 |
Decile 4 | 36 |
Decile 3 | 29.5 |
Decile 2 | 20.5 |
Decile 1 | 9.1 |
Minimum | 0 |
|
|
- Mean = 41.0322
- Std.dev = 20.6927
- 3 items have value -3 (Preferred not to answer)
- 2979 items have value -1 (Date uncertain or unknown)
|
Instance 3 : First repeat imaging visit (2019+)
6,469 participants, 15,595 items
Maximum | 85.3 |
Decile 9 | 67 |
Decile 8 | 60.5 |
Decile 7 | 55.3 |
Decile 6 | 49.5 |
Median | 42.5 |
Decile 4 | 35.5 |
Decile 3 | 29.5 |
Decile 2 | 20.5 |
Decile 1 | 8.5 |
Minimum | 0 |
|
|
- Mean = 40.8381
- Std.dev = 20.6741
- 1014 items have value -1 (Date uncertain or unknown)
|
Notes
This is the age participant indicated they were when the corresponding operation took place.
Coding 13 defines 2 special values:
- -1 represents "Date uncertain or unknown"
- -3 represents "Preferred not to answer"