Data
1,325,314 items of data are available, covering 395,083 participants.
Some values have special meanings defined by Data-Coding
13.
Defined-instances run from 0 to 3, labelled using Instancing
2.
Array indices run from 0 to 33.
Units of measurement are years.
| Maximum | 85.5 |
| Decile 9 | 63.5 |
| Decile 8 | 59.5 |
| Decile 7 | 55.5 |
| Decile 6 | 51.5 |
| Median | 47.5 |
| Decile 4 | 42.1 |
| Decile 3 | 35 |
| Decile 2 | 23 |
| Decile 1 | 9.5 |
| Minimum | 0 |
|
|
- Mean = 42.4946
- Std.dev = 19.2593
- 240 items have value -3 (Preferred not to answer)
- 50667 items have value -1 (Date uncertain or unknown)
|
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
374,788 participants, 901,726 items
| Maximum | 70.5 |
| Decile 9 | 62.3 |
| Decile 8 | 58.5 |
| Decile 7 | 55.5 |
| Decile 6 | 51.5 |
| Median | 48.2 |
| Decile 4 | 43.5 |
| Decile 3 | 38.5 |
| Decile 2 | 29.5 |
| Decile 1 | 16.5 |
| Minimum | 0 |
|
|
- Mean = 43.8666
- Std.dev = 16.8155
- 222 items have value -3 (Preferred not to answer)
- 32261 items have value -1 (Date uncertain or unknown)
|
Instance 1 : First repeat assessment visit (2012-13)
16,999 participants, 54,848 items
| Maximum | 76 |
| Decile 9 | 64.9 |
| Decile 8 | 60.8 |
| Decile 7 | 57.5 |
| Decile 6 | 53.5 |
| Median | 49.5 |
| Decile 4 | 43.6 |
| Decile 3 | 35.5 |
| Decile 2 | 23.7 |
| Decile 1 | 10 |
| Minimum | 0 |
|
|
- Mean = 43.5968
- Std.dev = 19.5584
- 5 items have value -3 (Preferred not to answer)
- 818 items have value -1 (Date uncertain or unknown)
|
Instance 2 : Imaging visit (2014+)
64,253 participants, 286,301 items
| Maximum | 85.5 |
| Decile 9 | 68.5 |
| Decile 8 | 62.7 |
| Decile 7 | 57.5 |
| Decile 6 | 51.6 |
| Median | 44.5 |
| Decile 4 | 31.5 |
| Decile 3 | 16.5 |
| Decile 2 | 8.5 |
| Decile 1 | 5.5 |
| Minimum | 0 |
|
|
- Mean = 38.7416
- Std.dev = 24.3536
- 13 items have value -3 (Preferred not to answer)
- 15465 items have value -1 (Date uncertain or unknown)
|
Instance 3 : First repeat imaging visit (2019+)
6,728 participants, 31,532 items
| Maximum | 85.4 |
| Decile 9 | 67.8 |
| Decile 8 | 61.4 |
| Decile 7 | 55.5 |
| Decile 6 | 48.7 |
| Median | 36.7 |
| Decile 4 | 20.9 |
| Decile 3 | 10 |
| Decile 2 | 7.5 |
| Decile 1 | 5.5 |
| Minimum | 0 |
|
|
- Mean = 35.4203
- Std.dev = 24.9127
- 2123 items have value -1 (Date uncertain or unknown)
|
Notes
This is the interpolated time when the participant indicated the corresponding condition was first diagnosed by a doctor, given as their estimated age.
- If the participant gave a calendar year, then the best-fit time is their age at the mid-point of that year. For example if the year was given as 1970, and the participant was born on 1 April 1950, then their age on 1st July 1970 is 20.25
then the value presented is 1970.5 - If the participant gave their age then the value presented is the fractional year corresponding to the mid-point of that age. For example, if the participant said they were 30 years old then the value is 30.5
- Interpolated values before the date of birth were truncated forwards to that time.
- Interpolated values after the time of data acquisition were truncated back to that time.
Coding 13 defines 2 special values:
- -1 represents "Date uncertain or unknown"
- -3 represents "Preferred not to answer"
