OHCA	Out-of-hospital cardiac arrest
EMS	Emergency medical services
ILCOR	International Liaison Committee on Resuscitation
ERC	European Resuscitation Council
BLS	Basic Life Support
CPR	Cardiopulmonary resuscitation
KDCA	Korea Disease Control and Prevention Agency
NFA	National Fire Agency
ATI	Awareness time interval
RDI	Regional Deprivation Index
CPC	Cerebral Performance Category
ED	Emergency department
SES	Socioeconomic status
DA	Dispatcher-assisted