Data
280,529 items of data are available, covering 229,668 participants.
Some values have special meanings defined by Data-Coding
2536.
Defined-instances run from 0 to 3, labelled using Instancing
2.
Units of measurement are questions.
| Maximum | 13 |
| Decile 9 | 10 |
| Decile 8 | 9 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 6 |
| Decile 2 | 5 |
| Decile 1 | 4 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 6.98371
- Std.dev = 2.12723
- 1 items have value -1 (Not calculable due to unclean data)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
165,344 participants, 165,344 items
| Maximum | 13 |
| Decile 9 | 10 |
| Decile 8 | 8 |
| Decile 7 | 7 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 5 |
| Decile 2 | 5 |
| Decile 1 | 4 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 6.84273
- Std.dev = 2.14827
|
Instance 1 : First repeat assessment visit (2012-13)
20,104 participants, 20,104 items
| Maximum | 13 |
| Decile 9 | 10 |
| Decile 8 | 9 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 6 |
| Decile 2 | 5 |
| Decile 1 | 5 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 7.12261
- Std.dev = 2.05397
|
Instance 2 : Imaging visit (2014+)
83,068 participants, 83,068 items
| Maximum | 13 |
| Decile 9 | 10 |
| Decile 8 | 9 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 7 |
| Decile 2 | 5 |
| Decile 1 | 5 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 7.17062
- Std.dev = 2.08733
- 1 items have value -1 (Not calculable due to unclean data)
|
Instance 3 : First repeat imaging visit (2019+)
12,013 participants, 12,013 items
| Maximum | 13 |
| Decile 9 | 10 |
| Decile 8 | 9 |
| Decile 7 | 8 |
| Decile 6 | 7 |
| Median | 7 |
| Decile 4 | 7 |
| Decile 3 | 7 |
| Decile 2 | 6 |
| Decile 1 | 5 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 7.39932
- Std.dev = 2.05982
|
Notes
Number of fluid intelligence questions attempted within time limit. As the questions were asked in a constant order, and it was not possible to skip any, this value also represents the highest numbered question that the participant attempted.
Coding 2536 defines 1 special value:
- -1 represents "Not calculable due to unclean data"
