Table 3.

TBI severity assessment (Mayo classification)

	TBI severity
	Moderate-severe (definite)	Mild probable	Symptomatic possible
Clinical features include any of
Loss of consciousness	Present ≥30 min	Momentary–30 min	—
Post-traumatic amnesia	Present ≥24 hours	Momentary–24 hours	—
Lowest Glasgow Coma Scale	<13	—	—
Neuroimaging shows any of	Intracerebral haematoma	Depressed, basilar or linear skull fracture	—
	Subdural haematoma	—	—
	Extradural haematoma	—	—
	Contusion (haemorrhagic)	—	—
	Penetrating injury (of dura)	—	—
	Subarachnoid haemorrhage	—	—
	Brainstem injury	—	—
Symptoms including any of	—	—	Visual blurring
	—	—	Mental state change/confusion
	—	—	Dazed
	—	—	Dizziness
	—	—	Focal neurological symptoms
	—	—	Headache
	—	—	Nausea

Classification of TBI severity based on clinical, neuroimaging and symptomatic features. Table adapted from Malec et al.³⁰

TBI, traumatic brain injury.