Data
555,251 items of data are available, covering 450,031 participants.
Some values have special meanings defined by Data-Coding
100291.
Defined-instances run from 0 to 3, labelled using Instancing
2.
| Maximum | 84 |
| Decile 9 | 51 |
| Decile 8 | 49 |
| Decile 7 | 45 |
| Decile 6 | 42 |
| Median | 36 |
| Decile 4 | 25 |
| Decile 3 | 17 |
| Decile 2 | 13 |
| Decile 1 | 9 |
| Minimum | 1 |
|
|
- There are 81 distinct values.
- Mean = 31.8825
- Std.dev = 17.0861
- 272 items have value -3 (Prefer not to answer)
- 18408 items have value -1 (Do not know)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
439,650 participants, 439,650 items
| Maximum | 70 |
| Decile 9 | 51 |
| Decile 8 | 49 |
| Decile 7 | 45 |
| Decile 6 | 42 |
| Median | 36 |
| Decile 4 | 25 |
| Decile 3 | 17 |
| Decile 2 | 13 |
| Decile 1 | 9 |
| Minimum | 1 |
|
|
- There are 70 distinct values.
- Mean = 31.7932
- Std.dev = 16.9208
- 225 items have value -3 (Prefer not to answer)
- 14455 items have value -1 (Do not know)
|
Instance 1 : First repeat assessment visit (2012-13)
19,111 participants, 19,111 items
| Maximum | 70 |
| Decile 9 | 52 |
| Decile 8 | 50 |
| Decile 7 | 45 |
| Decile 6 | 41 |
| Median | 35 |
| Decile 4 | 21 |
| Decile 3 | 16 |
| Decile 2 | 12 |
| Decile 1 | 9 |
| Minimum | 1 |
|
|
- There are 70 distinct values.
- Mean = 31.2216
- Std.dev = 17.4686
- 6 items have value -3 (Prefer not to answer)
- 584 items have value -1 (Do not know)
|
Instance 2 : Imaging visit (2014+)
84,587 participants, 84,587 items
| Maximum | 84 |
| Decile 9 | 54 |
| Decile 8 | 50 |
| Decile 7 | 45 |
| Decile 6 | 42 |
| Median | 37 |
| Decile 4 | 24 |
| Decile 3 | 17 |
| Decile 2 | 13 |
| Decile 1 | 9 |
| Minimum | 1 |
|
|
- There are 81 distinct values.
- Mean = 32.4383
- Std.dev = 17.727
- 39 items have value -3 (Prefer not to answer)
- 2938 items have value -1 (Do not know)
|
Instance 3 : First repeat imaging visit (2019+)
11,903 participants, 11,903 items
| Maximum | 78 |
| Decile 9 | 55 |
| Decile 8 | 50 |
| Decile 7 | 45 |
| Decile 6 | 41 |
| Median | 35 |
| Decile 4 | 24 |
| Decile 3 | 17 |
| Decile 2 | 13 |
| Decile 1 | 9 |
| Minimum | 1 |
|
|
- There are 77 distinct values.
- Mean = 32.3057
- Std.dev = 17.7987
- 2 items have value -3 (Prefer not to answer)
- 431 items have value -1 (Do not know)
|
Notes
ACE touchscreen question "What age did you first start to wear glasses or contact lenses?"
The following checks were performed:
- If answer < 1 then rejected
- If answer > Participants age then rejected
- If answer < 4 then participant asked to confirm
If the participant activated the Help button they were shown the message:
If you are unsure, please provide an estimate or select Do not know.
|
Field 2217 was collected from participants who indicated they wear glasses or contact lenses to correct their vision, as defined by their answers to Field 2207
Coding 100291 defines 2 special values:
- -1 represents "Do not know"
- -3 represents "Prefer not to answer"
