Table 1 Demographic data, event-related findings, and patient outcomes.

Patient no	1	2	3	4	5	6	7	8	9	10
Age, years	60	70	81	52	56	69	75	75	66	72
Gender	m	m	f	m	m	f	m	f	m	m
BMI	24	22	39	27	37	26	31	25	31	26
Initial ECG rhythm	PEA	PEA	PEA	ASY	PEA	VF	PEA	ASY	ASY	PEA
Presumed origin of cardiac arrest	Card	Resp.	Card	Card	Card	Card	Card	Card	Card	PE
Emergency scene	Home	Public	Home	Home	Business room	Public	Home	Home	Home	Nursing home
On-scene CPR, min	37	42	12	15	28	21	45	10	12	61
Total Hands-off time, s	34	n/a	64	222	107	67	n/a	115	76	231
Fraction of total Hands-off time, %	2	n/a	9	25	6	5	n/a	19	11	6
Hands-off time 5 min after intubation, s	34	n/a	36	40	31	45	16	28	40	8
Fraction of hands-off time 5 min after intubation, %	11	n/a	12	13	10	15	5	9	13	3
Mechanical chest compression system used	Yes	Yes	No	Yes	Yes	No	No	No	No	Yes
Outcome	CPR transport	ROSC	ROSC	Died on scene	CPR transport	Died on scene	Died on scene	Died on scene	Died on scene	ROSC

ASY = asystole; BMI = body-mass index; CPR = cardiopulmonary resuscitation; ECG = electrocardiography; n/a = not applicable; PEA = pulseless electrical activity; ROSC = return of spontaneous circulation; VF = ventricular fibrillation. Card. = presumed cardiac origin, Resp. = presumed respiratory origin, PE = presumed pulmonary embolism.

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