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 correct-answers.
| Maximum | 13 |
| Decile 9 | 8 |
| Decile 8 | 7 |
| Decile 7 | 7 |
| Decile 6 | 6 |
| Median | 6 |
| Decile 4 | 5 |
| Decile 3 | 4 |
| Decile 2 | 4 |
| Decile 1 | 3 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 5.59186
- Std.dev = 2.01729
- 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 | 8 |
| Decile 8 | 7 |
| Decile 7 | 6 |
| Decile 6 | 6 |
| Median | 5 |
| Decile 4 | 5 |
| Decile 3 | 4 |
| Decile 2 | 4 |
| Decile 1 | 3 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 5.39721
- Std.dev = 2.02829
|
Instance 1 : First repeat assessment visit (2012-13)
20,104 participants, 20,104 items
| Maximum | 13 |
| Decile 9 | 9 |
| Decile 8 | 7 |
| Decile 7 | 7 |
| Decile 6 | 6 |
| Median | 6 |
| Decile 4 | 5 |
| Decile 3 | 5 |
| Decile 2 | 4 |
| Decile 1 | 4 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 5.9418
- Std.dev = 1.98938
|
Instance 2 : Imaging visit (2014+)
83,068 participants, 83,068 items
| Maximum | 13 |
| Decile 9 | 8 |
| Decile 8 | 7 |
| Decile 7 | 7 |
| Decile 6 | 6 |
| Median | 6 |
| Decile 4 | 5 |
| Decile 3 | 5 |
| Decile 2 | 4 |
| Decile 1 | 3 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 5.83009
- Std.dev = 1.96622
- 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 | 9 |
| Decile 8 | 7 |
| Decile 7 | 7 |
| Decile 6 | 6 |
| Median | 6 |
| Decile 4 | 6 |
| Decile 3 | 5 |
| Decile 2 | 4 |
| Decile 1 | 4 |
| Minimum | 0 |
|
|
- There are 14 distinct values.
- Mean = 6.03796
- Std.dev = 1.93197
|
Notes
This is a simple unweighted sum of the number of correct answers given to the 13 fluid intelligence questions. Participants who did not answer all of the questions within the allotted 2 minute limit are scored as zero for each of the unattempted questions.
Coding 2536 defines 1 special value:
- -1 represents "Not calculable due to unclean data"
