Data
1,136,868 items of data are available, covering 406,816 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 | 2025.6 |
| Decile 9 | 2008.5 |
| Decile 8 | 2005.5 |
| Decile 7 | 2001.4 |
| Decile 6 | 1996.5 |
| Median | 1990.5 |
| Decile 4 | 1985.3 |
| Decile 3 | 1978.5 |
| Decile 2 | 1970.5 |
| Decile 1 | 1960.5 |
| Minimum | 1937.96 |
|
|
- Mean = 1988.07
- Std.dev = 18.448
- 57 items have value -3 (Preferred not to answer)
- 15862 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
390,827 participants, 858,618 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 = 17.307
- 53 items have value -3 (Preferred not to answer)
- 8544 items have value -1 (Date uncertain or unknown)
|
Instance 1 : First repeat assessment visit (2012-13)
16,255 participants, 35,144 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 = 18.9993
- 1 items have value -3 (Preferred not to answer)
- 102 items have value -1 (Date uncertain or unknown)
|
Instance 2 : Imaging visit (2014+)
76,847 participants, 194,578 items
| Maximum | 2025.5 |
| Decile 9 | 2018.5 |
| Decile 8 | 2014.5 |
| Decile 7 | 2010.5 |
| Decile 6 | 2005.3 |
| Median | 1998.8 |
| Decile 4 | 1991.7 |
| Decile 3 | 1984.5 |
| Decile 2 | 1974.8 |
| Decile 1 | 1963.5 |
| Minimum | 1939.5 |
|
|
- Mean = 1995.02
- Std.dev = 20.4902
- 3 items have value -3 (Preferred not to answer)
- 4161 items have value -1 (Date uncertain or unknown)
|
Instance 3 : First repeat imaging visit (2019+)
12,612 participants, 32,609 items
| Maximum | 2025.6 |
| Decile 9 | 2021.5 |
| Decile 8 | 2017.8 |
| Decile 7 | 2013.8 |
| Decile 6 | 2008.5 |
| Median | 2001.5 |
| Decile 4 | 1994.5 |
| Decile 3 | 1986.5 |
| Decile 2 | 1976.8 |
| Decile 1 | 1964.7 |
| Minimum | 1939.5 |
|
|
- Mean = 1997.39
- Std.dev = 21.0675
- 3055 items have value -1 (Date uncertain or unknown)
|
