Data
571,825 items of data are available, covering 499,726 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
499,600 participants, 499,600 items
Instance 1 : First repeat assessment visit (2012-13)
20,284 participants, 20,284 items
Instance 2 : Imaging visit (2014+)
48,482 participants, 48,482 items
Instance 3 : First repeat imaging visit (2019+)
3,459 participants, 3,459 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
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