Subsequent shock deliveries are associated with increased favorable neurological outcomes in cardiac arrest patients who had initially non-shockable rhythms

Table 3 Multivariate analysis for factors associated with favorable neurological outcome at 1 month after cardiac arrest in patients with initially nonshockable rhythms

	Odds ratio (95 % CI)	P value
Age (per year)	0.97 (0.96–0.98)	<0.0001
Male	0.99 (0.58–1.69)	0.97
Public location	1.54 (0.90–2.62)	0.11
Witnessed arrest	1.30 (0.75–2.24)	0.35
Bystander CPR	0.83 (0.47–1.48)	0.54
Call–response interval^a (per minute)	0.91 (0.83–0.99)	0.037
Initial rhythm PEA	11.3 (5.94–21.6)	<0.0001
Cardiac etiology	1.82 (1.07–3.09)	0.028
Subsequently shocked	2.78 (1.45–5.30)	0.0020

P values calculated using a multivariate logistic regression
^aShock delivery time was the interval from the initiation of CPR by EMS providers to the first shock delivery by EMS providers
CI confidence interval, CPR cardiopulmonary resuscitation, EMS emergency medical service, PEA pulseless electrical activity

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