I'm currently working on a form that has group of responded to a select one questions.
Does ODK XLSForm has this something like table-list in a table-list format?
For example, a question "Urine test is checked and recorded." will be answered by Yes/No by Case 1, Case 2 and Case 3 respondents.
Here's a screenshot on what table
A work around would be to make a repeat for each case, and then automatically calculate the sum ("All - Qty Yes" field)
Please see if this thread is relevant for your case:
I hope this helps!