Dear user,
Great question! The age variables are always tricky with DHS data. The variable Hw1 in the kids recode (KR file) is the variable that responds to the ages of the kids that were measured for height and weight as part of the household questionnaire. The abbreviation hw is short hand for height and weight. So that variable is corresponding to the ages of children who were weighed and measured, which is not every child in the survey.

If you are in the KR file and wanting to produce the indicator "Pourcentage ayant eu de la fièvre au cours des deux semaines ayant précédé l'enquête" you don't have to specify the age of the children since data in the children's recode is only children under five years of age of interviewed mothers. However, it is always good to include an age restricting variable just in case. In this example the variable agemonth is calculated by subtracting the child's age from the date of the interview.

You can use the code below to replicate the indicator on page 153

*Open Dataset
use "BUKR61FL.DTA", clear 

*Generate the weight variable
gen wt= v005/1000000

*Mother reported fever in child during 2 weeks preceding the survey
g fever=(h22==1)

*Create age in months variable
g agemonth=.
replace agemonth=v008-b3

*Percentage who had fever in the two weeks preceding the survey
tab fever if b5==1 & agemonth<60 [iweight=wt]

*Percentage who had fever in the two weeks preceding the survey
tab fever if b5==1 [iweight=wt]