Table 2.

Injury/admission data.

Gender	Male, Female
Age (in years at time of admission)	… (option for ‘Unknown’)
Mechanism of injury	-Road traffic collision (Pedestrian, Cyclist, Motorcyclist, Motorcyclist – passenger, Car – driver, Car – passenger, other type of vehicle – driver, other type of vehicle – passenger -Fall (standing height, from height) -Assault (without a weapon, blunt instrument, knife, firearm) -Other (Self Harm, Animal attack, Explosion, Sport/recreational activity, Industrial accident – that does not fit into the categories listed above, Other violence, Unknown, Other)
Date / time of injury	… (option for ‘Unknown’)
Date / time of admission to hospital where surgery is taking place	…
Was the patient directly transferred from the accident scene to the hospital where surgery is taking place?	Yes, No
Method of transport to the hospital where surgery is taking place	Helicopter - air ambulance, Land ambulance - staffed by paramedics, Land ambulance - not staffed by paramedics. Police, Private vehicle, By foot, Other - specify
American Society of Anaesthesiologists (ASA) Physical Status Classification	I, II, III, IV, V
Glasgow Coma Score on admission (or last documented GCS off sedation if sedated on admission)	Total and Eyes, Verbal (‘T’ if intubated/tracheostomy), Motor (option for ‘Unknown’)
	Left	Right
Fixed and dilated pupil at any time point pre-operatively?
Unreactive pupil at any point pre-operatively?
Did the patient have an episode of hypoxia at any point prior to surgery?	Yes, No, Not measured prior to surgery
Did the patient have an episode of hypotension (systolic BP < 90 mmHg*) at any point prior to surgery?	Yes, No, Not measured prior to surgery
* Note that the lower limit of systolic BP differs for children with age according to the formula 90 + (2 × age in years)
Major extra-cranial injury (defined as requiring hospital admission in its own right)?	Yes, No
Was a CT Head performed before the operation?	Yes, No