Patient and injury characteristicsa.

a For studies presenting data from several patient populations or several sub-analyses, the reported patient characteristics refer to the total patient population.b Presented as mean, mean ± SD, mean (95% CI), median, median (IQR) or as percentage per category, as reported by the authors or as calculated from the available data.c Multiple analyses with two different control groups (no prehospital invasive airway management, intubation in the emergency department) performed in the study. The presented data are for the subpopulation of patients intubated in the emergency department.d Study reports sub-analyses for patients with isolated TBI.GCS: Glasgow Coma Scale; H-AIS: head abbreviated injury scale; ISS: injury severity scale; NR: not reported; TBI: traumatic brain injuryPatient and injury characteristicsa.