I've never heard or read of the levels myself, but came to the conclusion that they must be using some scale as a point of reference when my Pdoc started using the term "Severe" 2 years ago, when putting anything on paper for me.

[emoji848]
When I first saw it I was honestly really aggro, bummed, ticked off and relieved all in one.

Your T has piqued my curiosity now. Think I will ask Parker next session if I don't forget.