Table 2.

Variables for analysis

Patient factors	System factors	Clinical factors
Age	Time of collapse	Adrenaline dose (mg)
Gender	Time to basic resuscitation	Progression to a shockable rhythm
Arrest witnessed	Time to advanced resuscitation	Defibrillation
Bystander resuscitation	Duration of arrest	End-tidal carbon dioxide
Co-morbidities	Duration of basic life support (BLS)	Heart rate
Place of arrest	Duration of advanced life support (ALS)	Return of spontaneous circulation
Family wishes considered	Total duration of out of hospital cardiac arrest	Rationale for cessation of resuscitation