Table 2.

Core patient variables

Data variable number	Data variable name	Type of data	Data variable categories or values	Definition of data variable
6	Co-morbidity	Ordinal	1 = No (ASA-PS = 1) 2 = Yes (ASA-PS = 2-6) 3 = Unknown	ASA-PS definition 1 = A normal healthy patient 2 = A patient with mild systemic disease 3 = A patient with severe systemic disease 4 = A patient with severe systemic disease that is a constant threat to life 5 = A moribund patient who is not expected to survive without the operation 6 = A declared brain-dead patient whose organs are being removed for donor purposes
7	Age	Continuous	YY or MM	Years rounded down. Ages under 1 year are reported in decimals (e.g., 6 month = 0.5 year)
8	Gender	Nominal	1 = Female 2 = Male 3 = Unknown	Patient gender
9	Patient category	Nominal	1 = Blunt trauma (incl. burns and strangulation) 2 = Penetrating trauma 3 = Non trauma (incl. drowning and asphyxia) 4 = Unknown	Dominating reason for emergency treatment
10	Indication for airway intervention	Nominal	1 = Decreased level of consciousness 2 = Hypoxemia 3 = Ineffective ventilation 4 = Existing airway obstruction 5 = Impending airway obstruction 6 = Combative or uncooperative 7 = Relief of pain or distress 8 = Cardiopulmonary arrest 9 = Other, specify	Dominating indication for airway intervention
11	Respiratory rate, initial	Continuous	Number/ Not recorded	First value recorded by the EMS provider on scene
12a	Systolic blood pressure, initial	Continuous	Number/ Not recorded	First value recorded by the EMS provider on scene
13a	Heart rate, initial	Continuous	Number/ Not recorded	First value recorded by the EMS provider on scene
14	GCS, initial (m/v/e)	Ordinal	Motor 1-6 Verbal 1-5 Eyes 1-4 Not recorded	First value recorded by the EMS provider on scene See also GCS definitions
15a	SpO2, initial; state: with or without supplemental O2	Continuous and nominal	Number/Not recorded 1 = Without supplemental O2 2 = With supplemental O2 3 = Unknown if supplemental O2	First value recorded by the EMS provider on scene

ASA-PS: American Society of Anesthesiologists physical status

EMS: Emergency Medical Service

GCS: Glasgow Coma Score