Use of Analysis column

Hi all,
I have received a questionnaire which contains ‘analysis column’ that I have never used. This column shows some letters like: C, U, V, D. Could anyone please explain the use of this column and meaning of this specific letters. I tried to search it in community forum, but, got nothing which explains my query. Thanks in advance. Questionnaire is attached herewith. Kobo questionaries -2021.xlsx (51.1 KB)

@tasfik_rukan, it should be something like having a remarks column to keep something like a note in the XLSForm that should help you remind with your analysis plan later on. You could try having an arbitrary column name and then typing some notes for your reference.