Table 2.

Epidemiologic characteristics of resuscitation-attempted out-of hospital cardiac arrests with cardiac aetiology in Seoul and Osaka between 2006 and 2011

	Seoul		Osaka		p Value
	N	Per cent	N	Per cent
Total	11 082		25 210
Gender, male	7598	68.6	14 513	57.6	<0.01
Age, years, median (IQR)	67 (54–77)		76 (66–84)		<0.01
Prehospital initial shockable ECG	750	6.8	2772	11.0	<0.01
Place of arrest, public	2052	18.5	3106	12.3	<0.01
Witnessed	5949	53.7	10 307	40.9	<0.01
Bystander CPR	723	6.5	9907	39.3	<0.01
Bystander defibrillation	1	0.0	231	0.9	<0.01
Defibrillated by EMS	1225	11.1	4032	16.0	<0.01
Time interval, min, median (IQR)
From call to EMS arrival	6 (5–8)		7 (6–9)		<0.01
From scene to departure	6 (4–9)		13 (10–17)		<0.01
From call to hospital arrival	20 (16–25)		27 (23–33)		<0.01
From call to first CPR, n, min*	1684	5 (2–8)	25 148	7 (3–9)	<0.01
From call to first defibrillation, n, min*,†	208	9 (7–12)	1960	9 (7–12)	0.62
Survival outcomes
Survival on hospital arrival	228	2.1	2158	8.6	<0.01
Survival to discharge	909	8.2	2004	7.9	0.48
Good neurological recovery	293	2.6	1166	4.6	<0.01

p Values were calculated by χ² test for category variables and Wilcoxon rank sums test for continuous variables.

*Intervals from call to first CPR or defibrillation for Seoul were available in only the 2011 data.

†Interval from call to first defibrillation was calculated for the prehospital initial shockable rhythm.

CPR, cardiopulmonary resuscitation; EMS, emergency medical service; OHCA, out-of-hospital cardiac arrest.