| Alert | no signs of CNS depression |
| Drowsy | all patients between alert & stuporous |
| Stuporous | responds to verbal or tactile stimuli |
| Coma 1 | responds to painful stimuli only, normal BP & Respiration |
| Coma 2 | no response to painful stimuli, normal BP & Respiration |
| Coma 3 | no response to painful stimuli, abnormal respiratory pattern &/or low but adequate BP |
| Coma 4 | no response to painful stimuli, apnoea or inadequate respiration &/or inadequate BP |
Plum F, Posner JB. The diagnosis of stupor and coma.Contemp Neurol Ser 1972;10:1-286