Table 1.

Baseline characteristics of the studies, ASPIRE (AutoPulse Assisted Prehospital International Resuscitation); CIRC (Circulation Improving Resuscitation Care); CPR (Cardiopulmonary Resuscitation); LINC (LUCAS in Cardiac Arrest); N/A (Not Available); PARAMEDIC (The Prehospital Randomized Assessment of A Mechanical Compression Device in Cardiac Arrest); VF (Ventricular Fibrillation); VT (Ventricular Tachycardia); PEA (Pulseless Electrical Activity).

Studies (Year)	Setting	Groups	n	Age	Men (%)	CPR by bystander (%)	VF /VT (%)	PEA (%)	Asystole (%)
ASPIRE [17]	OHCA	Manual	373	66	66	35	32	25	40
		AutoPulse	394	67	64	32	31	20	42
Axelsson et al. [22]	OHCA	Manual	169	71	66	42	32	12	34
		LUCAS	159	71	63	45	30	18	34
Smekal et al. [23]	OHCA	Manual	73	71	68	31	N/A	N/A	N/A
		LUCAS	75	75	68	34	N/A	N/A	N/A
LINC [18]	OHCA	Manual	1289	69	66	55	30	20	46
		LUCAS	1300	69	67	57	29	20	47
CIRC [19]	OHCA	Manual	2132	66	61	47	24	NA	NA
		AutoPulse	2099	66	61	49	21	NA	NA
PARAMEDIC [20]	OHCA	Manual	2819	72	63	44	22	25	49
		LUCAS	1652	71	63	43	23	24	50
Koster et al. [14]	OHCA/ IHCA	Manual	137	66	64	NA	25	39	24
		AutoPulse	115	65	65	NA	26	38	23
		LUCAS	122	63	67	NA	34	34	18