: Data-Field 2744

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Data

271,445 items of data are available, covering 221,386 participants.
Some values have special meanings defined by Data-Coding 100585.
Defined-instances run from 0 to 3, labelled using Instancing 2.
Units of measurement are pounds.

Maximum	16
Decile 9	8
Decile 8	8
Decile 7	8
Decile 6	7
Median	7
Decile 4	7
Decile 3	7
Decile 2	6
Decile 1	6
Minimum	2

There are 15 distinct values.
Mean = 7.01625
Std.dev = 1.21471
2890 items below graph minimum of 4
585 items above graph maximum of 10
348 items have value -3 (Prefer not to answer)
1690 items have value -2 (Only had twins)
3751 items have value -1 (Do not know)

4 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
221,298 participants, 221,298 items

Maximum	16
Decile 9	8
Decile 8	8
Decile 7	8
Decile 6	7
Median	7
Decile 4	7
Decile 3	7
Decile 2	6
Decile 1	6
Minimum	2

There are 15 distinct values.
Mean = 6.99917
Std.dev = 1.21951
2427 items below graph minimum of 4
475 items above graph maximum of 10
296 items have value -3 (Prefer not to answer)
1361 items have value -2 (Only had twins)
3089 items have value -1 (Do not know)

Instance 1 : First repeat assessment visit (2012-13)
8,260 participants, 8,260 items

Maximum	16
Decile 9	8
Decile 8	8
Decile 7	8
Decile 6	7
Median	7
Decile 4	7
Decile 3	7
Decile 2	6
Decile 1	6
Minimum	2

There are 14 distinct values.
Mean = 7.07396
Std.dev = 1.17538
70 items below graph minimum of 4
17 items above graph maximum of 10
4 items have value -3 (Prefer not to answer)
37 items have value -2 (Only had twins)
79 items have value -1 (Do not know)

Instance 2 : Imaging visit (2014+)
36,807 participants, 36,807 items

Maximum	14
Decile 9	8
Decile 8	8
Decile 7	8
Decile 6	7
Median	7
Decile 4	7
Decile 3	7
Decile 2	6
Decile 1	6
Minimum	2

There are 13 distinct values.
Mean = 7.09215
Std.dev = 1.19444
345 items below graph minimum of 4
87 items above graph maximum of 10
45 items have value -3 (Prefer not to answer)
259 items have value -2 (Only had twins)
520 items have value -1 (Do not know)

Instance 3 : First repeat imaging visit (2019+)
5,080 participants, 5,080 items

Maximum	12
Decile 9	8
Decile 8	8
Decile 7	8
Decile 6	7
Median	7
Decile 4	7
Decile 3	7
Decile 2	6
Decile 1	6
Minimum	2

There are 11 distinct values.
Mean = 7.11604
Std.dev = 1.1847
48 items below graph minimum of 4
6 items above graph maximum of 10
3 items have value -3 (Prefer not to answer)
33 items have value -2 (Only had twins)
63 items have value -1 (Do not know)

Notes

ACE touchscreen question "What was the birth weight of your first child in pounds? (do not include twins)"

The following checks were performed:

If answer < 2 then rejected
If answer > 16 then rejected
If answer > 12 then participant asked to confirm

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

If you are unsure of the weight in pounds, here is a conversion table for pounds, grams and kilograms.

Pounds Grams Kilograms
2 907 0.91
3 1361 1.36
4 1814 1.81
5 2268 2.27
6 2721 2.72
7 3175 3.18
8 3629 3.63
9 4082 4.08
10 4536 4.54
11 4990 4.99
12 5443 5.44
13 5897 5.90
14 6350 6.35
15 6804 6.80

An exact answer is not necessary. Please enter the birthweight to the closest pound.
If your first birth was twins or other multiple birth, enter the birthweight of the first singleton birth.
If you have only had twins or other multiple births then select Only twins.

Field 2744 was collected from women who indicated they had given birth to at least one child, as defined by their answers to Field 2734

Coding 100585 defines 3 special values:

-1 represents "Do not know"
-2 represents "Only had twins"
-3 represents "Prefer not to answer"

1 Related Data-Field

Field ID	Description	Relationship
2734	Number of live births	Current Field was collected from women who indicated they had given birth to at least one child, as defined by their answers to Field 2734

2 Resources

Preview	Name	Res ID
	Screenshot from touchscreen questionnaire used to capture field 2744	100543
	Touchscreen questionnaire ordering, validation and dependencies	113241

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