Data
1,097,890 items of data are available, covering 404,824 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 | 60.5 |
| Decile 8 | 54.4 |
| Decile 7 | 48.6 |
| Decile 6 | 43.2 |
| Median | 38 |
| Decile 4 | 32.4 |
| Decile 3 | 26 |
| Decile 2 | 18 |
| Decile 1 | 8.5 |
| Minimum | 0 |
|
|
- Mean = 36.5673
- Std.dev = 18.52
- 57 items have value -3 (Preferred not to answer)
- 13919 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
390,996 participants, 859,017 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 = 35.4619
- Std.dev = 17.7675
- 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+)
67,530 participants, 168,188 items
| Maximum | 86.3 |
| Decile 9 | 67.5 |
| Decile 8 | 61 |
| Decile 7 | 55.5 |
| Decile 6 | 49.8 |
| Median | 43.2 |
| Decile 4 | 36.3 |
| Decile 3 | 29.5 |
| Decile 2 | 20.5 |
| Decile 1 | 9.4 |
| Minimum | 0 |
|
|
- Mean = 41.1807
- Std.dev = 20.7334
- 3 items have value -3 (Preferred not to answer)
- 3481 items have value -1 (Date uncertain or unknown)
|
Instance 3 : First repeat imaging visit (2019+)
8,595 participants, 21,539 items
| Maximum | 85.3 |
| Decile 9 | 68.5 |
| Decile 8 | 62.2 |
| Decile 7 | 56.5 |
| Decile 6 | 51 |
| Median | 44.5 |
| Decile 4 | 37.5 |
| Decile 3 | 30.5 |
| Decile 2 | 21.5 |
| Decile 1 | 9.5 |
| Minimum | 0 |
|
|
- Mean = 42.1738
- Std.dev = 20.9906
- 1790 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"
