: Data-Field 20116

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Data

643,197 items of data are available, covering 501,087 participants, encoded using Data-Coding 90.
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
501,046 participants, 501,046 items
Graph illustrating main data

Instance 1 : First repeat assessment visit (2012-13)
20,314 participants, 20,314 items
Graph illustrating main data

Instance 2 : Imaging visit (2014+)
100,917 participants, 100,917 items
Graph illustrating main data

Instance 3 : First repeat imaging visit (2019+)
20,920 participants, 20,920 items
Graph illustrating main data

Notes

Derived using variables "Current tobacco smoking" (Field 1239) and "Past tobacco smoking" (Field 1249).

Classified as Never (0) if Current tobacco smoking = prefer not to say (-3) or no (0) AND Past tobacco smoking = just tried once or twice (3) or I have never smoked (4).

Classified as Previous (1) if Current tobacco smoking = no (0) AND Past tobacco smoking = smoked on most or all days (1) or smoked occasionally (2).

Classified as Current (2) if Current tobacco smoking = yes, on most or all days (1) or only occasionally (2).

Classified as Prefer not to say (-3) if either of the following conditions is met:

Current tobacco smoking = prefer not to say (-3) AND Past tobacco smoking = smoked on most or all days (1) or smoked occasionally (2).
Current tobacco smoking= no (0) AND Past tobacco smoking= prefer not to say (-3).

2 Related Data-Fields

Field ID	Description	Relationship
1239	Current tobacco smoking	Current Field is partially derived from Field 1239
1249	Past tobacco smoking	Current Field is partially derived from Field 1249

1 Resource

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

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