Table 2

Cox regression analyses of long-term mortality

	Unadjusted			Adjusted
	HR	95% CI	p Value	HR	95% CI	p Value
Age (per 10 years)	1.59	1.51 to 1.68	<0.001	1.59	1.37 to 1.84	<0.001
Male gender	0.93	0.79 to 1.10	0.4	1.17	0.97 to 1.40	0.09
Response time (per 1 min)	0.98	0.97 to 1.00	0.026	0.98	0.95 to 1.01	0.2
Aetiology
Cardiac	Ref			Ref
Trauma	0.35	0.16 to 0.79	0.011	0.79	0.35 to 1.82	0.6
Respiratory	1.06	0.79 to 1.41	0.7	1.05	0.76 to 1.43	0.8
Overdose/poisoning	0.61	0.37 to 0.99	0.047	1.77	0.94 to 3.34	0.08
Other	0.74	0.52 to 1.07	0.11	0.87	0.58 to 1.32	0.5
Witness/bystander CPR
Not witnessed, no CPR	Ref			Ref
Bystander witnessed, no CPR	1.51	1.09 to 2.09	0.013	1.67	1.15 to 2.41	0.006
Not witnessed, CPR	1.17	0.76 to 1.78	0.5	1.51	0.94 to 2.42	0.9
Bystander witnessed, CPR	1.19	0.86 to 1.66	0.3	1.52	1.05 to 2.21	0.027
EMS witnessed	1.33	0.97 to 1.83	0.07	1.13	0.74 to 1.72	0.6
Location
Private residence	Ref			Ref
Aged care facility/supported accommodation	3.25	2.44 to 4.33	<0.001	2.29	1.68 to 3.13	<0.001
Public location	0.80	0.67 to 0.95	0.011	0.81	0.66 to 1.00	0.046
Ambulance	0.96	0.65 to 1.39	0.8	0.96	0.63 to 1.45	0.8
Other	1.04	0.77 to 1.41	0.8	0.99	0.72 to 1.36	1
Transported to PCI-capable hospital	0.79	0.67 to 0.94	0.007	0.76	0.61 to 0.94	0.011
Metropolitan region	0.84	0.69 to 1.01	0.07	1.01	0.79 to 1.30	0.9
Discharged home	0.59	0.50 to 0.71	<0.001	0.79	0.66 to 0.95	0.014

All variables shown are included in the adjusted model. Models stratified by initial arrest rhythm.
CPR, cardiopulmonary resuscitation; EMS, emergency medical service; PCI, percutaneous coronary intervention.