Data
365,805 items of data are available, covering 315,187 participants.
Some values have special meanings defined by Data-Coding
100291.
Defined-instances run from 0 to 3, labelled using Instancing
2.
Units of measurement are years.
| Maximum | 109 |
| Decile 9 | 90 |
| Decile 8 | 86 |
| Decile 7 | 83 |
| Decile 6 | 80 |
| Median | 77 |
| Decile 4 | 74 |
| Decile 3 | 70 |
| Decile 2 | 64 |
| Decile 1 | 56 |
| Minimum | 10 |
|
|
- There are 98 distinct values.
- Mean = 74.8275
- Std.dev = 13.2943
- 267 items have value -3 (Prefer not to answer)
- 6401 items have value -1 (Do not know)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
298,377 participants, 298,377 items
| Maximum | 109 |
| Decile 9 | 89 |
| Decile 8 | 85 |
| Decile 7 | 82 |
| Decile 6 | 80 |
| Median | 76 |
| Decile 4 | 73 |
| Decile 3 | 69 |
| Decile 2 | 64 |
| Decile 1 | 56 |
| Minimum | 10 |
|
|
- There are 98 distinct values.
- Mean = 74.1292
- Std.dev = 13.249
- 248 items have value -3 (Prefer not to answer)
- 5691 items have value -1 (Do not know)
|
Instance 1 : First repeat assessment visit (2012-13)
14,387 participants, 14,387 items
| Maximum | 104 |
| Decile 9 | 91 |
| Decile 8 | 87 |
| Decile 7 | 84 |
| Decile 6 | 82 |
| Median | 79 |
| Decile 4 | 76 |
| Decile 3 | 72 |
| Decile 2 | 67 |
| Decile 1 | 59 |
| Minimum | 21 |
|
|
- There are 84 distinct values.
- Mean = 76.5613
- Std.dev = 13.0414
- 2 items have value -3 (Prefer not to answer)
- 192 items have value -1 (Do not know)
|
Instance 2 : Imaging visit (2014+)
49,065 participants, 49,065 items
| Maximum | 109 |
| Decile 9 | 93 |
| Decile 8 | 89 |
| Decile 7 | 86 |
| Decile 6 | 84 |
| Median | 81 |
| Decile 4 | 78 |
| Decile 3 | 74 |
| Decile 2 | 68 |
| Decile 1 | 60 |
| Minimum | 13 |
|
|
- There are 94 distinct values.
- Mean = 78.2501
- Std.dev = 13.0553
- 16 items have value -3 (Prefer not to answer)
- 478 items have value -1 (Do not know)
|
Instance 3 : First repeat imaging visit (2019+)
3,976 participants, 3,976 items
| Maximum | 105 |
| Decile 9 | 92 |
| Decile 8 | 89 |
| Decile 7 | 86 |
| Decile 6 | 83 |
| Median | 81 |
| Decile 4 | 78 |
| Decile 3 | 74 |
| Decile 2 | 69 |
| Decile 1 | 60 |
| Minimum | 25 |
|
|
- There are 78 distinct values.
- Mean = 78.2206
- Std.dev = 12.8303
- 1 items have value -3 (Prefer not to answer)
- 40 items have value -1 (Do not know)
|
Notes
ACE touchscreen question "What was her age when she died?"
The following checks were performed:
- If answer < 10 then rejected
- If answer > 122 then rejected
- If answer < 15 then participant asked to confirm
- If answer > 105 then participant asked to confirm
Field 3526 was collected from participants who indicated their mother has died, as defined by their answers to Field 1835 or, if they are adopted, their adopted mother has died, as defined by their answers to Field 1835
Coding 100291 defines 2 special values:
- -1 represents "Do not know"
- -3 represents "Prefer not to answer"
