Which is not a very scientific method, and at best, queries people with vastly differing quality of care, access to experts, tests, and treatments, which across the board is rather poor at this point. No rational conclusion can be drawn.
Additionally, I'm not sure I could answer such a questionnaire accurately. In July, 2016, I was operating at about 40% of normal, and today, after a comprehensive treatment program, I am at 85% of normal. I still crash, etc. but my life involves careful normal activity interrupted by regular treatment which can last all day on a regular basis.
So, I don't think I was ever "very severe" though I was extremely ill and much worse than "moderate," and I am not in remission, but probably "mild." And, I can't really say that any treatment lifted me up one level on this scale.
But, optimizing methylation and reducing oxidative and nitrosative stress has been a foundation of my successful treatment plan, with IVIG, Valcyte, pyridostigmine, mast cell meds, beta blockers, HBOT, and hormones each having important roles. Any one of these treatments would not be sufficient to change my level on your scale.
The other aspect of this is that it is well understood that there are different subsets of patients with different triggers and characteristics producing the same symptoms. So, if you were to do Chiari surgery on everyone, it would dramatically help those who actually needed it, and could make many others much worse. So, any across the board treatment is pretty meaningless, unless proper testing is done to identify who needs it and how much they need, with what cofactors.