What is the best term to indicate people's opinions seeing something as "not important" and "less important"? Please help

I got trouble in determining the simple noun for describing the percentage of participants that answers "not important" and "less important" over several items distributed in my questionnaire.

What do you think about the following options to name that description:

(1) Number of disapproval responses

(2) Disapproval rating

(3) Number of negative answers

Or, do you have any additional views regarding this specification system?

Help me, please. Thank you in advance.