Data
525,185 items of data are available, covering 447,447 participants.
Some values have special meanings defined by Data-Coding
100291.
Defined-instances run from 0 to 3, labelled using Instancing
2.
| Maximum | 80 |
| 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 79 distinct values.
- Mean = 31.839
- Std.dev = 17.0272
- 252 items have value -3 (Prefer not to answer)
- 17185 items have value -1 (Do not know)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
439,839 participants, 439,839 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 = 31.7925
- Std.dev = 16.9204
- 225 items have value -3 (Prefer not to answer)
- 14463 items have value -1 (Do not know)
|
Instance 1 : First repeat assessment visit (2012-13)
19,117 participants, 19,117 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 = 31.2241
- Std.dev = 17.4673
- 6 items have value -3 (Prefer not to answer)
- 585 items have value -1 (Do not know)
|
Instance 2 : Imaging visit (2014+)
61,209 participants, 61,209 items
| Maximum | 80 |
| Decile 9 | 53 |
| 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 79 distinct values.
- Mean = 32.3059
- Std.dev = 17.6017
- 20 items have value -3 (Prefer not to answer)
- 1981 items have value -1 (Do not know)
|
Instance 3 : First repeat imaging visit (2019+)
5,020 participants, 5,020 items
| Maximum | 76 |
| Decile 9 | 53 |
| Decile 8 | 50 |
| Decile 7 | 45 |
| Decile 6 | 42 |
| Median | 39 |
| Decile 4 | 25 |
| Decile 3 | 18 |
| Decile 2 | 13.5 |
| Decile 1 | 10 |
| Minimum | 1 |
|
|
- There are 76 distinct values.
- Mean = 32.5628
- Std.dev = 17.3847
- 1 items have value -3 (Prefer not to answer)
- 156 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"
