Table 1.

Demographics of patients enrolled in a study of the effect of paramedic out-of-hospital cardiac arrest (OHCA) case volume on return of spontaneous circulation (ROSC).

Characteristic	Result
Paramedic OHCA experience over previous 5 years (mean, SD)	23.6 (±20.3)
Male (%)	61.7
Non-Caucasian (%)	30.8
Age (mean, SD)	66.5 (±15.2)
Shockable rhythm (%)	30.0
Layperson/first responder CPR (%)	44.0
EMS response time in minutes (mean, SD)	8.3 (±4.8)
ROSC (%)	49.3

SD, standard deviation; CPR, cardiopulmonary resuscitation; EMS, emergency medical services.