Fig. 1

Derivation of the study population for EDRSI and PHRSI groups. EMS, Emergency Medical Service; KSS, Air Ambulance Charity Kent Surrey Sussex; MTC, Major Trauma Centre; RSI, Rapid Sequence Intubation; PHRSI, Pre-hospital Rapid Sequence Intubation; EDRSI, Emergency Department Rapid Sequence Intubation; ED, Emergency Department; HEMS, Helicopter Emergency Medical Services