TABLE 4.

Event Intervals

Event Interval, minTotalTotal NonsurvivorsSurvivors
Median(IQR)Median(IQR)Median(IQR)
Discovery interval8(0–60)10(0–60)0(0–4)
Call-response interval5(3–6)5(3–6)4(3–5)
Scene interval9(5–13)9(5–13)10(6–15)
Transport interval5(4–8)5(4–8)5.5(4–9)
Total EMS interval (response + scene + transport)20(16–26)20(15–26)21(16–29)
Start-stop CPR interval36(27–47)36(29–48)16(10–30)
Interval to CPR10(3–60)13(4–64)3(0–5)
  • Note that intervals are not generally independent: total EMS interval includes the call-response interval, scene interval, and transport interval; start-stop CPR interval may include the call-response interval, scene interval, and transport intervals; interval to CPR includes discovery interval and also includes the call-response interval in cases of CPR performed by EMS only.