I don't know how correct they are ..
.. but I watched some video on YouTube and the title was similar to "9 signs you may have severe depression" .. well, I checked 7 out of 9 of them.
I don't think they were so far off, I scored similar on the MADRS test.
Though, I'd let the professionals do the diagnosis as it is not my field of expertise, I know computers, not squishy humans.