Table 2. Primary and Secondary Outcomes in a Study of Intra-arrest Transport, Extracorporeal Cardiopulmonary Resuscitation, and Immediate Invasive Assessment and Treatment in Refractory Out-of-Hospital Cardiac Arrest.

	No. (%)		Absolute difference, % (95% CI)	P value
	Invasive strategy (n = 124)	Standard strategy (n = 132)
Primary outcome
Survival with minimal or no neurologic impairment at 180 da	39 (31.5)	29 (22.0)	9.5 (−1.3 to 20.1)	.09
Secondary outcomes
Survival with minimal or no neurologic impairment at 30 da	38 (30.6)	24 (18.2)	12.4 (1.9 to 22.7)	.02
Cardiac recovery at 30 db	54 (43.5)	45 (34.1)	9.4 (−2.5 to 21)	.12

^a Defined as Cerebral Performance Category 1 or 2. The Cerebral Performance Category schema ranges from 1 (defined as conscious, alert, able to work), 2 (conscious, sufficient cerebral function for independent activities of daily life, able to work in sheltered environment), 3 (conscious, dependent on others for daily support), 4 (comatous, vegetative state) to 5 (defined as brain death). All patients observed to death or 180 days.

^b Defined as absence of both pharmacological and mechanical cardiac support for at least 24 hours.