Data
1,030,889 items of data are available, covering 401,228 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 31.
Units of measurement are years.
| Maximum | 2023.1 |
| Decile 9 | 2007.5 |
| Decile 8 | 2004.5 |
| Decile 7 | 2000.5 |
| Decile 6 | 1995.5 |
| Median | 1990 |
| Decile 4 | 1984.5 |
| Decile 3 | 1977.5 |
| Decile 2 | 1969.5 |
| Decile 1 | 1959.9 |
| Minimum | 1937.96 |
|
|
- Mean = 1987.06
- Std.dev = 17.8609
- 57 items have value -3 (Preferred not to answer)
- 10101 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
391,168 participants, 859,390 items
| Maximum | 2010.71 |
| Decile 9 | 2006.5 |
| Decile 8 | 2003.5 |
| Decile 7 | 1999.5 |
| Decile 6 | 1994.5 |
| Median | 1989.5 |
| Decile 4 | 1983.5 |
| Decile 3 | 1977.3 |
| Decile 2 | 1969.5 |
| Decile 1 | 1959.5 |
| Minimum | 1937.96 |
|
|
- Mean = 1986.13
- Std.dev = 17.3063
- 53 items have value -3 (Preferred not to answer)
- 8554 items have value -1 (Date uncertain or unknown)
|
Instance 1 : First repeat assessment visit (2012-13)
16,274 participants, 35,180 items
| Maximum | 2013.43 |
| Decile 9 | 2010.5 |
| Decile 8 | 2007.5 |
| Decile 7 | 2002.5 |
| Decile 6 | 1997.5 |
| Median | 1991.5 |
| Decile 4 | 1985.5 |
| Decile 3 | 1978.5 |
| Decile 2 | 1969.5 |
| Decile 1 | 1958.5 |
| Minimum | 1938.62 |
|
|
- Mean = 1988.19
- Std.dev = 19.0019
- 1 items have value -3 (Preferred not to answer)
- 103 items have value -1 (Date uncertain or unknown)
|
Instance 2 : Imaging visit (2014+)
48,666 participants, 116,452 items
| Maximum | 2023.1 |
| Decile 9 | 2016.5 |
| Decile 8 | 2012.5 |
| Decile 7 | 2008.5 |
| Decile 6 | 2002.5 |
| Median | 1996.5 |
| Decile 4 | 1989.5 |
| Decile 3 | 1982.5 |
| Decile 2 | 1973.2 |
| Decile 1 | 1962.5 |
| Minimum | 1939.5 |
|
|
- Mean = 1992.96
- Std.dev = 19.9827
- 3 items have value -3 (Preferred not to answer)
- 1349 items have value -1 (Date uncertain or unknown)
|
Instance 3 : First repeat imaging visit (2019+)
4,313 participants, 9,709 items
| Maximum | 2022.5 |
| Decile 9 | 2017.5 |
| Decile 8 | 2013.5 |
| Decile 7 | 2008.6 |
| Decile 6 | 2002.5 |
| Median | 1996.5 |
| Decile 4 | 1990.4 |
| Decile 3 | 1983.5 |
| Decile 2 | 1974.5 |
| Decile 1 | 1964.05 |
| Minimum | 1939.56 |
|
|
- Mean = 1993.75
- Std.dev = 19.67
- 95 items have value -1 (Date uncertain or unknown)
|
