Table 1 Characteristics of the patients before propensity score matching

Age (year)

Gender, male (%)

Bystander performed CPR, n (%)

VF/VT as initial rhythm at starting CPR by EMTs, n (%)

Asystole, n (%)

Pulseless electrical activity, n (%)

VT, n (%)

VF, n (%)

Advanced life support by a physician in the ambulance, n (%)

From call receipt to ambulance stop (min)

From call receipt to start CPR by EMTs (min)

From witnessed cardiac arrest to start CPR by EMTs (min)

From the start of CPR by EMTs to departure from the scene (min)

From the start of CPR by EMTs to arrival at the hospital (min)

CPR time (min)

From witnessed cardiac arrest to the first epinephrine administration (min)

From start CPR by EMTs to the first epinephrine administration (min)

Frequency of epinephrine administration until arrival at the hospital

Outcome

ROSC before arrival at the hospital, n (%)

From start CPR by EMTs to ROSC (min)

Admission to the intensive care units, n (%)

Survival 7 days after the cardiac arrest, n (%)

Survival 30 days after the cardiac arrest, n (%)

Favorable neurological state 30 days after, n (%)

Good performance

Moderate disability

Severe disability

Vagitative

Dead