: Data-Field 20160

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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.

Graph illustrating main data

4 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
499,485 participants, 499,485 items
Graph illustrating main data

Instance 1 : First repeat assessment visit (2012-13)
20,283 participants, 20,283 items
Graph illustrating main data

Instance 2 : Imaging visit (2014+)
64,687 participants, 64,687 items
Graph illustrating main data

Instance 3 : First repeat imaging visit (2019+)
5,344 participants, 5,344 items
Graph illustrating main data

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

1 Resource

Preview	Name	Res ID
	Touchscreen questionnaire ordering, validation and dependencies	113241

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