Data
589,799 items of data are available, covering 499,647 participants, encoded using Data-Coding
7.
Defined-instances run from 0 to 3, labelled using Instancing
2.
4 Instances
Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
499,485 participants, 499,485 items
Instance 1 : First repeat assessment visit (2012-13)
20,283 participants, 20,283 items
Instance 2 : Imaging visit (2014+)
64,687 participants, 64,687 items
Instance 3 : First repeat imaging visit (2019+)
5,344 participants, 5,344 items
Notes
Derived using variables "Current tobacco smoking" (
Field 1239) and "Past tobacco smoking" (
Field 1249).
Individual classed as Eversmoker if Current tobacco smoking= most days (1) or occasionally (2) OR Past tobacco smoking= most days (1) or occasionally (2) or tried once or twice (3).
Individual were classed as Neversmoker if Current tobacco smoking= no (0) AND Past tobacco smoking= never (4).
Individuals who answered to either question "Do not know" (-1) "Prefer not to answer" (-3) and "None of the above" (-7) were not coded.
This derived data field has come from Professor Martin Tobin at the University of Leicester.
0 Related Data-Fields
There are no related data-fields