The CAA chart is very interesting. I know they are being cautious, but IMHO this is very out of date.
You might just want to pass the chart in front of the intensivist who looked after you on ITU and ask him to confirm you definately are in the severe category. It is quite possible to electively sedate and ventilate a patient with effectively no pathology as we undertake what is called the head injury protocol first and investigate later. I doubt you would have been on ITU for a week, but you may not have had the CT / MRI changes to justify the severe category, and if you were sedated this isnt LOC.
Bit of a long shot, but anyone else in this category should get independant confirmation from their intensivist or neurologist.