Data
1,054,414 items of data are available, covering 402,661 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 |
Decile 8 | 53.8 |
Decile 7 | 48.4 |
Decile 6 | 42.7 |
Median | 37.5 |
Decile 4 | 32.1 |
Decile 3 | 25.7 |
Decile 2 | 17.6 |
Decile 1 | 8.5 |
Minimum | 0 |
|
|
- Mean = 36.233
- Std.dev = 18.3005
- 57 items have value -3 (Preferred not to answer)
- 11351 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
391,155 participants, 859,364 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 = 35.4613
- Std.dev = 17.7669
- 53 items have value -3 (Preferred not to answer)
- 8553 items have value -1 (Date uncertain or unknown)
|
Instance 1 : First repeat assessment visit (2012-13)
16,273 participants, 35,179 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 = 38.0702
- Std.dev = 19.5358
- 1 items have value -3 (Preferred not to answer)
- 103 items have value -1 (Date uncertain or unknown)
|
Instance 2 : Imaging visit (2014+)
56,312 participants, 136,705 items
Maximum | 85.2 |
Decile 9 | 66.4 |
Decile 8 | 60 |
Decile 7 | 54.4 |
Decile 6 | 48.5 |
Median | 42.1 |
Decile 4 | 35.5 |
Decile 3 | 28.9 |
Decile 2 | 19.7 |
Decile 1 | 8.5 |
Minimum | 0 |
|
|
- Mean = 40.3454
- Std.dev = 20.378
- 3 items have value -3 (Preferred not to answer)
- 2192 items have value -1 (Date uncertain or unknown)
|
Instance 3 : First repeat imaging visit (2019+)
5,146 participants, 11,758 items
Maximum | 84 |
Decile 9 | 65.35 |
Decile 8 | 58.5 |
Decile 7 | 53.2 |
Decile 6 | 46.9 |
Median | 40.5 |
Decile 4 | 34.5 |
Decile 3 | 28.2 |
Decile 2 | 18.6 |
Decile 1 | 8.5 |
Minimum | 0 |
|
|
- Mean = 39.3236
- Std.dev = 20.1915
- 503 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"