Table 2.

Characteristics of non-DOA OHCAs.

	All	Witnessed	Unwitnessed
No.	1,374	511	855
Age (mean ± SD)	60.4 ± 18.9	60.9 ± 17.4	60.0 ± 19.7
Race (%)
White	53.3	56.8	51.7
Black	44.7	41.9	46.6
Other	1.7	1.4	1.8
Sex (%)
Male	60.6	66.5	57.4
Female	39.0	33.5	42.6
Presenting rhythm (%)
Asystole	50.2	30.9	62.0
Vfib	23.2	37.2	15.0
Vtach	0.7	1.8	0.1
PEA	25.0	29.8	22.2
Unknown	1.0	0.4	0.7

Abbreviations: PEA, pulseless electrical activity; Vfib, ventricular fibrillation; Vtach, ventricular tachycardia.