: Data-Field 2887

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Data

135,618 items of data are available, covering 118,658 participants.
Some values have special meanings defined by Data-Coding 100353.
Defined-instances run from 0 to 3, labelled using Instancing 2.
Units of measurement are cigarettes/day.

Maximum	140
Decile 9	30
Decile 8	25
Decile 7	20
Decile 6	20
Median	20
Decile 4	15
Decile 3	15
Decile 2	10
Decile 1	10
Minimum	1

There are 66 distinct values.
Mean = 18.8613
Std.dev = 10.3207
1843 items above graph maximum of 50
188 items have value -10 (Less than one a day)
876 items have value -1 (Do not know)

4 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
115,450 participants, 115,450 items

Maximum	140
Decile 9	30
Decile 8	25
Decile 7	20
Decile 6	20
Median	20
Decile 4	15
Decile 3	15
Decile 2	10
Decile 1	10
Minimum	1

There are 64 distinct values.
Mean = 19.0712
Std.dev = 10.4999
1698 items above graph maximum of 50
164 items have value -10 (Less than one a day)
716 items have value -1 (Do not know)

Instance 1 : First repeat assessment visit (2012-13)
4,770 participants, 4,770 items

Maximum	100
Decile 9	30
Decile 8	20
Decile 7	20
Decile 6	20
Median	20
Decile 4	15
Decile 3	15
Decile 2	10
Decile 1	9
Minimum	1

There are 36 distinct values.
Mean = 18.5453
Std.dev = 9.70309
51 items above graph maximum of 51
4 items have value -10 (Less than one a day)
33 items have value -1 (Do not know)

Instance 2 : Imaging visit (2014+)
14,245 participants, 14,245 items

Maximum	120
Decile 9	30
Decile 8	20
Decile 7	20
Decile 6	20
Median	18
Decile 4	15
Decile 3	12
Decile 2	10
Decile 1	8
Minimum	1

There are 43 distinct values.
Mean = 17.3701
Std.dev = 8.95437
88 items above graph maximum of 52
20 items have value -10 (Less than one a day)
119 items have value -1 (Do not know)

Instance 3 : First repeat imaging visit (2019+)
1,153 participants, 1,153 items

Maximum	80
Decile 9	30
Decile 8	20
Decile 7	20
Decile 6	20
Median	20
Decile 4	15
Decile 3	12
Decile 2	10
Decile 1	8
Minimum	1

There are 27 distinct values.
Mean = 17.5328
Std.dev = 8.64744
5 items above graph maximum of 52
8 items have value -1 (Do not know)

Notes

ACE touchscreen question "About how many cigarettes did you smoke on average each day? "

The following checks were performed:

If answer < 1 then rejected
If answer > 150 then rejected
If answer > 100 then participant asked to confirm

If the participant activated the Help button they were shown the message:

Count the total number of cigarettes (including both hand-rolled and
manufactured cigarettes if both were smoked)
For hand-rolled cigarettes:
- One ounce of tobacco makes about 30 cigarettes
- One gram of tobacco makes about 1 cigarette

Field 2887 was collected from participants who indicated that in the past they smoked on most or all days, as defined by their answers to Field 1249 and they smoked manufactured or hand-rolled cigarettes in the past, as defined by their answers to Field 1249

Coding 100353 defines 2 special values:

-10 represents "Less than one a day"
-1 represents "Do not know"

2 Related Data-Fields

Field ID	Description	Relationship
1249	Past tobacco smoking	Field 1249 affects who was asked to answer Current Field
2877	Type of tobacco previously smoked	Field 2877 affects who was asked to answer Current Field

2 Resources

Preview	Name	Res ID
	Screenshot from touchscreen questionnaire used to capture field 2887	100488
	Touchscreen questionnaire ordering, validation and dependencies	113241

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