Data
582,714 items of data are available, covering 501,542 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 hours/day.
| Maximum | 23 |
| Decile 9 | 8 |
| Decile 8 | 8 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 7 |
| Decile 2 | 6 |
| Decile 1 | 6 |
| Minimum | 1 |
|
|
- There are 23 distinct values.
- Mean = 7.15676
- Std.dev = 1.1035
- 1142 items below graph minimum of 4
- 2344 items above graph maximum of 10
- 403 items have value -3 (Prefer not to answer)
- 3153 items have value -1 (Do not know)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
501,522 participants, 501,522 items
| Maximum | 23 |
| Decile 9 | 8 |
| Decile 8 | 8 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 7 |
| Decile 2 | 6 |
| Decile 1 | 6 |
| Minimum | 1 |
|
|
- There are 23 distinct values.
- Mean = 7.15421
- Std.dev = 1.11138
- 1056 items below graph minimum of 4
- 2146 items above graph maximum of 10
- 385 items have value -3 (Prefer not to answer)
- 2942 items have value -1 (Do not know)
|
Instance 1 : First repeat assessment visit (2012-13)
20,334 participants, 20,334 items
| Maximum | 16 |
| Decile 9 | 8 |
| Decile 8 | 8 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 7 |
| Decile 2 | 6 |
| Decile 1 | 6 |
| Minimum | 1 |
|
|
- There are 16 distinct values.
- Mean = 7.23467
- Std.dev = 1.05838
- 26 items below graph minimum of 4
- 62 items above graph maximum of 10
- 4 items have value -3 (Prefer not to answer)
- 55 items have value -1 (Do not know)
|
Instance 2 : Imaging visit (2014+)
55,584 participants, 55,584 items
| Maximum | 16 |
| Decile 9 | 8 |
| Decile 8 | 8 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 7 |
| Decile 2 | 6 |
| Decile 1 | 6 |
| Minimum | 1 |
|
|
- There are 16 distinct values.
- Mean = 7.15124
- Std.dev = 1.05212
- 56 items below graph minimum of 4
- 120 items above graph maximum of 10
- 13 items have value -3 (Prefer not to answer)
- 144 items have value -1 (Do not know)
|
Instance 3 : First repeat imaging visit (2019+)
5,274 participants, 5,274 items
| Maximum | 13 |
| Decile 9 | 8 |
| Decile 8 | 8 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 7 |
| Decile 2 | 6 |
| Decile 1 | 6 |
| Minimum | 3 |
|
|
- There are 11 distinct values.
- Mean = 7.15529
- Std.dev = 1.04126
- 4 items below graph minimum of 4
- 16 items above graph maximum of 10
- 1 items have value -3 (Prefer not to answer)
- 12 items have value -1 (Do not know)
|
Notes
ACE touchscreen question "About how many hours sleep do you get in every 24 hours? (please include naps)"
The following checks were performed:
- If answer < 1 then rejected
- If answer > 23 then rejected
- If answer < 3 then participant asked to confirm
- If answer > 12 then participant asked to confirm
If the participant activated the Help button they were shown the message:
If the time you spend sleeping varies a lot, give the
average time for a 24 hour day in the last 4 weeks.
|
Coding 100291 defines 2 special values:
- -1 represents "Do not know"
- -3 represents "Prefer not to answer"
