The C/NC categories include: no coma (level 0), near coma (level 1), moderate coma (level 2), marked coma (level 3), and extreme coma (level 4).
https://www.sciencedirect.com/topics/medicine-and-dentistry/...

Most classifications of traumatic brain injury include considerations of alteration or loss of consciousness, coma level and duration, amnesia, complications such
http://cpancf.com/headinjuryclassification.html

The severity of coma impairment however is categorized into several levels. Patients may or may not progress through these levels. In the first level, the brain responsiveness lessens, normal reflexes are lost, the patient no longer responds to pain and cannot hear.

The Rancho Los Amigos Scale is a complex scale that has eight separate levels, and is often used in the first few weeks or months of coma while the patient is under closer observation, and when shifts between levels are more frequent.
https://en.wikipedia.org/wiki/Coma

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Research shows that a comatose patient's outcome relates closely to the Glasgow Coma Scale score. The less severe the score recorded within the first 24 hours of going into a coma, the more likely a patient will make a good

https://www.sharecare.com/health/coma-treatment/how-people-r...