: Data-Field 20160

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Data

621,635 items of data are available, covering 499,476 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
499,265 participants, 499,265 items
Graph illustrating main data

Instance 1 : First repeat assessment visit (2012-13)
20,277 participants, 20,277 items
Graph illustrating main data

Instance 2 : Imaging visit (2014+)
89,473 participants, 89,473 items
Graph illustrating main data

Instance 3 : First repeat imaging visit (2019+)
12,620 participants, 12,620 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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