Table 2.

Event operational descriptors.

Data variable no.	Data point name	Type of data	Data point categories or values	Type	Definition of data variable	Reference/comment
10a	Call received at Emergency Medical Communication Centre (EMCC)	Continuous	hh:mm		The time when the alarm call is answered at the initial EMCC	Utstein Trauma Registry 2008, Utstein Dispatch 2008
10b	Unit arrival on scene	Continuous	hh:mm		The time when the vehicle stops at a location as close as possible to the patient	Utstein cardiac arrest, 2004
10c	Patient leaving scene	Continuous	hh:mm		The time when the patient is transferred from the original location or time of death if dead on scene	ROC Epistry CA 2005, proposed revision from project organiser: change "from scene" to " from original location"
10d	Patient arrival at hospital		hh:mm		The time when the patient is formally transferred to receiving medical facility personnel	Proposed by project group
11	Type of dispatch	Nominal	1 = Primary medical mission	Bullet list	Includes all primary missions other than trauma (medical, surgical, paediatric and obstetric)	Proposed by expert panel
			2 = Primary trauma mission
			3 = Interhospital transfer mission
			4 = Search and rescue mission
			5 = Consultation
			6 = Other
12	Type of transportation	Nominal	1 = Ground ambulance	Check box	Main type of vehicle used to transport the patient to definitive care.	Abbreviated definition according to Utstein Trauma Registry 2008
			2 = Helicopter ambulance
			3 = Fixed-wing
			4 = Other
			5 = No transportation
13	Result of dispatch	Nominal	1 = Patient attended	Bullet list	Dispatch means unit alarmed for mission or request/advice/supervision	Proposed by expert panel
			2 = Mission aborted due to weather
			3 = Mission aborted due to technical reasons
			4 = Mission aborted not required
			5 = Mission aborted alternative tasking
			6 = Supervision/advice only

hh:mm: hours: minutes