Data
144,781 items of data are available, covering 124,630 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 | 82 |
| Decile 9 | 57 |
| Decile 8 | 50 |
| Decile 7 | 46 |
| Decile 6 | 42 |
| Median | 39 |
| Decile 4 | 35 |
| Decile 3 | 32 |
| Decile 2 | 29 |
| Decile 1 | 25 |
| Minimum | 8 |
|
|
- There are 74 distinct values.
- Mean = 39.73
- Std.dev = 11.6948
- 96 items have value -3 (Prefer not to answer)
- 698 items have value -1 (Do not know)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
120,941 participants, 120,941 items
| Maximum | 70 |
| Decile 9 | 57 |
| Decile 8 | 51 |
| Decile 7 | 46 |
| Decile 6 | 42 |
| Median | 39 |
| Decile 4 | 35 |
| Decile 3 | 32 |
| Decile 2 | 29 |
| Decile 1 | 25 |
| Minimum | 8 |
|
|
- There are 63 distinct values.
- Mean = 39.8595
- Std.dev = 11.6097
- 86 items have value -3 (Prefer not to answer)
- 601 items have value -1 (Do not know)
|
Instance 1 : First repeat assessment visit (2012-13)
5,067 participants, 5,067 items
| Maximum | 74 |
| Decile 9 | 57 |
| Decile 8 | 50 |
| Decile 7 | 45 |
| Decile 6 | 40 |
| Median | 38 |
| Decile 4 | 34 |
| Decile 3 | 30 |
| Decile 2 | 28 |
| Decile 1 | 25 |
| Minimum | 9 |
|
|
- There are 62 distinct values.
- Mean = 39.0967
- Std.dev = 11.919
- 1 items have value -3 (Prefer not to answer)
- 17 items have value -1 (Do not know)
|
Instance 2 : Imaging visit (2014+)
17,226 participants, 17,226 items
| Maximum | 82 |
| Decile 9 | 57 |
| Decile 8 | 50 |
| Decile 7 | 45 |
| Decile 6 | 40 |
| Median | 37 |
| Decile 4 | 34 |
| Decile 3 | 30 |
| Decile 2 | 28 |
| Decile 1 | 25 |
| Minimum | 14 |
|
|
- There are 68 distinct values.
- Mean = 39.1079
- Std.dev = 12.1721
- 7 items have value -3 (Prefer not to answer)
- 78 items have value -1 (Do not know)
|
Instance 3 : First repeat imaging visit (2019+)
1,547 participants, 1,547 items
| Maximum | 75 |
| Decile 9 | 55 |
| Decile 8 | 50 |
| Decile 7 | 45 |
| Decile 6 | 40 |
| Median | 38 |
| Decile 4 | 34 |
| Decile 3 | 30 |
| Decile 2 | 27 |
| Decile 1 | 24 |
| Minimum | 14 |
|
|
- There are 60 distinct values.
- Mean = 38.6248
- Std.dev = 11.7981
- 2 items have value -3 (Prefer not to answer)
- 2 items have value -1 (Do not know)
|
Notes
ACE touchscreen question "How old were you when you last smoked on most days?"
The following checks were performed:
- If answer < 5 then rejected
- If answer > Participants age then rejected
- If answer < 12 then participant asked to confirm
Field 2897 was collected from participants who indicated that in the past they smoked tobacco on most or all days, as defined by their answers to Field 1249
Coding 100291 defines 2 special values:
- -1 represents "Do not know"
- -3 represents "Prefer not to answer"
