: Data-Field 874

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Data

598,113 items of data are available, covering 480,994 participants.
Some values have special meanings defined by Data-Coding 100291.
Defined-instances run from 0 to 3, labelled using Instancing 2.
Units of measurement are minutes/day.

Maximum	1440
Decile 9	120
Decile 8	75
Decile 7	60
Decile 6	45
Median	30
Decile 4	30
Decile 3	20
Decile 2	20
Decile 1	15
Minimum	0

There are 310 distinct values.
Mean = 60.9757
Std.dev = 75.6173
25584 items above graph maximum of 225
661 items have value -3 (Prefer not to answer)
60002 items have value -1 (Do not know)

4 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
477,541 participants, 477,541 items

Maximum	1440
Decile 9	120
Decile 8	75
Decile 7	60
Decile 6	45
Median	30
Decile 4	30
Decile 3	20
Decile 2	20
Decile 1	15
Minimum	0

There are 293 distinct values.
Mean = 61.6453
Std.dev = 78.8038
22055 items above graph maximum of 225
576 items have value -3 (Prefer not to answer)
51684 items have value -1 (Do not know)

Instance 1 : First repeat assessment visit (2012-13)
19,686 participants, 19,686 items

Maximum	720
Decile 9	120
Decile 8	60
Decile 7	60
Decile 6	40
Median	30
Decile 4	30
Decile 3	20
Decile 2	20
Decile 1	15
Minimum	0

There are 102 distinct values.
Mean = 50.2568
Std.dev = 56.4581
506 items above graph maximum of 225
13 items have value -3 (Prefer not to answer)
1496 items have value -1 (Do not know)

Instance 2 : Imaging visit (2014+)
88,358 participants, 88,358 items

Maximum	1400
Decile 9	120
Decile 8	90
Decile 7	60
Decile 6	60
Median	40
Decile 4	30
Decile 3	30
Decile 2	20
Decile 1	15
Minimum	0

There are 184 distinct values.
Mean = 59.6646
Std.dev = 63.2262
2641 items above graph maximum of 225
62 items have value -3 (Prefer not to answer)
6093 items have value -1 (Do not know)

Instance 3 : First repeat imaging visit (2019+)
12,528 participants, 12,528 items

Maximum	1000
Decile 9	120
Decile 8	90
Decile 7	60
Decile 6	60
Median	45
Decile 4	30
Decile 3	30
Decile 2	20
Decile 1	20
Minimum	0

There are 79 distinct values.
Mean = 62.4903
Std.dev = 60.4777
383 items above graph maximum of 220
10 items have value -3 (Prefer not to answer)
729 items have value -1 (Do not know)

Notes

ACE touchscreen question "How many minutes did you usually spend walking on a typical DAY?"

The following checks were performed:

If answer < 0 then rejected
If answer > 1440 then rejected
If answer < 10 then participant asked to confirm
If answer > 300 then participant asked to confirm

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

Count the number of minutes that you usually spend walking in one day.
If the time you usually spend walking on each day of the week varies a
lot, give an average of the time you spend walking. For instance if on
one day of the week you usually walk for 4 hours but on the other day
you walk 2 hours then give the average - that is 3 hours.

Field 874 was collected from participants who indicated that they walked for 10 minutes on at least 1 day per week in the previous 4 weeks, as defined by their answers to Field 864

Coding 100291 defines 2 special values:

-1 represents "Do not know"
-3 represents "Prefer not to answer"

2 Related Data-Fields

Field ID	Description	Relationship
10953	Duration of walks (pilot)	Field 10953 is the pilot-study predecessor of main-study Current Field
864	Number of days/week walked 10+ minutes	Current Field was collected from participants who indicated that they walked for 10 minutes on at least 1 day per week in the previous 4 weeks, as defined by their answers to Field 864

2 Resources

Preview	Name	Res ID
	Screenshot from touchscreen questionnaire used to capture field 874	100472
	Touchscreen questionnaire ordering, validation and dependencies	113241

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