Table 1

List of included studies

First author, year	Study design	Study location, period	Utstein style (yes/no)	Overall, N	Age (years)	VF/VT (%)	Witnessed (%)	Bystander CPR (%)	Comatose (%)	STEMI (%)	TH (%)	ECA (%)
Aurore et al, 16 2011	SC cohort	France, 2000–2006	Yes	445	61	32	NR	24	NR	17.5	7	30
Bougouin et al,29 2014	MC cohort	France, 2011–2013	Yes	1264	59.9	26	90.9	39.9	NR	NR	58	58
Bro-Jeppesen et al,17 2012	SC Cohort	Copenhagen, 2004–2010	Yes	360	61	80	86	59	NR	32	90	55
Callaway et al,7 2014	MC cohort	USA and Canada, 2007–2009	Yes	3981	67	40.7	70	41.5	NR	14	39.3	19.2
Casellaet al,28 2015	SC cohort	Italy, 2004–2012	Yes	141	64.5	71	94	NR	100	34	100	69
Dankiewicz et al,18 2015	MC cohort	Europe and Australia, 2010–2013	Yes	544	66	75	90	71	NR	0	49	46
Geriet al,19 2015	MC cohort	France, 2000–2013	Yes	1722	60	54.6	86.7	46.1	NR	18.5	71	63.5
Hollenbeck et al,20 2014	MC cohort	USA, 2005–2011	NR	269	60.3	100	85.1	56.5	56.5	0	100	45.4
Kleissner et al,21 2015	SC cohort	Czech Republic, 2007–2014	NR	99	57.5	73	42	44	NR	0	100	25
Mooney et al,5 2011	SC cohort	USA, 2006–2009	Yes	140	62	76	82	66	NR	48.8	NR	72
Nanjayya and Nayyar2012	SC cohort	Australia, 2003–2008	NR	70	60.7	100	91	69	100	89	65.7	50
Nielsen et al,23 2009	MC cohort	Sweden, 2004–2008	Yes	986	63	70	86	62	NR	NR	NR	49
Strote et al,24 2012	MC cohort	USA, 1999–2002	NR	240	66.24	100	83.3	50	NR	34.2	NR	25
Tømte et al,25 2011	SC cohort	Norway, 2003–2009	NR	248	62	90	94	80	70	58.5	60.8	77
Vyas et al,6 2014	MC cohort	USA, 2010–2013	Yes	4029	61	100	81	49	NR	19.9	58.7	48.5
Weiser et al,26 2013	SC cohort	Vienna, 2005–2010	Yes	249	58	88	91	37	45	100	64	79
Zanuttini et al,27 2012	SC cohort	Italy, 2008–2011	Yes	93	67	64.5	84	57	NR	34	NR	51.6

CPR, cardiopulmonary resuscitation; ECA, early coronary angiography; MC, multi-center; NR, not reported; SC, single center; STEMI, ST-elevation myocardial infarction; TH, therapeutic hypothermia; VF, ventricular fibrillation; VT, ventricular tachycardia.