OK, in this case you could do the same as outlined in the image shared below:
In the survey tab of your xlsform:
In the choices tab of your xlsform:
Data entry screen as seen in Enketo: Mild
Data entry screen as seen in Enketo: Mild
Data entry screen as seen in Enketo: Severe
Data entry screen as seen in Enketo: Severe
Data entry screen as seen in Enketo: Very Severe
Reference xlsform:
Composite Index.xlsx (13.4 KB)