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| Age Categories and BMI Data in SPSS [message #30509] |
Thu, 12 December 2024 05:51  |
ruram1m@cmich.edu
Messages: 2
Registered: June 2024
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Member |
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Subject: Assistance Needed with Age Categories and BMI Data in SPSS
Hello,
I am currently working on a project at DHS (2017-2018) in Bangladesh. I need some clarification regarding the age categories for children (B8) because I see many unclear values such as (0,1,2,3,4,5,6,7,8,9,10,11) in the codebook. Specifically, I'd like to know the correct categories as 0-6 months, 7-12, 13-24, or any clear definition for children's ages.
Additionally, I have collected BMI data (z-scores): -490, -207, 77, -3, and 253. How can I define the values? I would appreciate your guidance on how to recode these values into categories such as normal weight, underweight, severe underweight, and overweight.
Thank you for your assistance!
Best regards
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| Re: Age Categories and BMI Data in SPSS [message #30520 is a reply to message #30509] |
Fri, 13 December 2024 13:18  |
Janet-DHS
Messages: 938
Registered: April 2022
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Senior Member |
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Following is a response from DHS staff member, Tom Pullum:
DHS staff do not use SPSS. On our GitHub site we do have SPSS (and Stata and R) code for all the standard indicators and tables. On the forum, code may be provided in Stata, but users have to translate it to SPSS.
I believe you are looking at the BR file, because you refer to ages above 4. Height and weight are only measured for children age 0-4. It will be a little easier if you use the KR file, which only contains children age 0-4.
In the BR and KR files, the "v" variables refer to the mother. They are attached to each child's record. I hope you realize that v445 is the BMI of the mother, not the child. The KR file includes the BMI of the child as hw73.
b8 is age in completed years, for living children. You may be looking for age in completed months. That variable is b19, although b19 is also given for children who have died, in which case it is interpreted as completed months since the birth. You can restrict to living children by requiring b5=1. Ranges of b19, for children who have b5=1, will give you age intervals such as "0-6 months, 7-12, 13-24".
hw73 is a z score for the BMI for children age 0-59 months (all children in the KR file). It has been multiplied by 100 (for example hw73=100 for 1 standard deviation above the mean) and it has special codes 9996-9998. 77, for example, is z=.77
. label list HW73
HW73:
9996 height out of plausible limits
9997 age in days out of plausible limits
9998 flagged cases
BMI is a useful indicator for adults but not for children. It does not have categories such as "normal" or "overweight" that are used for adults. The categories "stunted", "underweight", "overweight" and "wasted" are calculated from the HAZ, WAZ, and WHZ, which are given by hw70-hw72. You can get more information about BMI for children at the WHO website: https:// www.who.int/toolkits/child-growth-standards/standards/body-m ass-index-for-age-bmi-for-age
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