Data
1,097,890 items of data are available, covering 404,824 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 | 2024.6 |
| Decile 9 | 2008.4 |
| Decile 8 | 2004.5 |
| Decile 7 | 2000.5 |
| Decile 6 | 1995.9 |
| Median | 1990.5 |
| Decile 4 | 1984.6 |
| Decile 3 | 1978.5 |
| Decile 2 | 1970.1 |
| Decile 1 | 1960.2 |
| Minimum | 1937.96 |
|
|
- Mean = 1987.67
- Std.dev = 18.2313
- 57 items have value -3 (Preferred not to answer)
- 13919 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
390,996 participants, 859,017 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 = 17.3069
- 53 items have value -3 (Preferred not to answer)
- 8546 items have value -1 (Date uncertain or unknown)
|
Instance 1 : First repeat assessment visit (2012-13)
16,268 participants, 35,170 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 = 19.0003
- 1 items have value -3 (Preferred not to answer)
- 102 items have value -1 (Date uncertain or unknown)
|
Instance 2 : Imaging visit (2014+)
67,530 participants, 168,188 items
| Maximum | 2024.6 |
| Decile 9 | 2017.8 |
| Decile 8 | 2014.5 |
| Decile 7 | 2009.5 |
| Decile 6 | 2004.5 |
| Median | 1998.5 |
| Decile 4 | 1991 |
| Decile 3 | 1983.5 |
| Decile 2 | 1974.3 |
| Decile 1 | 1963 |
| Minimum | 1939.5 |
|
|
- Mean = 1994.3
- Std.dev = 20.4068
- 3 items have value -3 (Preferred not to answer)
- 3481 items have value -1 (Date uncertain or unknown)
|
Instance 3 : First repeat imaging visit (2019+)
8,595 participants, 21,539 items
| Maximum | 2024.6 |
| Decile 9 | 2019.5 |
| Decile 8 | 2016.5 |
| Decile 7 | 2012.5 |
| Decile 6 | 2006.5 |
| Median | 2000.5 |
| Decile 4 | 1993.5 |
| Decile 3 | 1985.5 |
| Decile 2 | 1976.2 |
| Decile 1 | 1964.7 |
| Minimum | 1939.56 |
|
|
- Mean = 1996.42
- Std.dev = 20.6171
- 1790 items have value -1 (Date uncertain or unknown)
|
