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Table 2 Observed and predicted ROSC rates for different patient subgroups

From: External validation of the ROSC after cardiac arrest (RACA) score in a physician staffed emergency medical service system

Factor Patients (n) Observed ROSC (95% CI;%) Predicted ROSC (%) Impact
Team leader
 Specialist 392 50.3 (45.4–55.3) 52.6 Neutral
 Registrar 210 54.8 (48.1–61.5) 52.7 Neutral
 Medical supervisor 78 35.9 (25.2–46.6) 49.1 Negative
Primary rhythm
 VF/VT 275 66.9 (61.3–72.5) 65.8 Neutral
 PEA/Asystole 399 37.6 (32.8–42.4) 43.4 Negative
Rescue unit as first responder
 Yes 69 49.3 (37.5–61.1) 50.9 Neutral
 No 611 50.1 (46.1–54.1) 52.4 Neutral
Delay to ALS unit
  < median 389 54.2 (49.2–59.1) 55.1 Neutral
  > median 291 44.3 (38.6–50.0) 48.4 Neutral
Adrenaline
 Yes 513 41.1 (36.8–45.3) 50.2 Negative
 No 167 77.2 (70.8–83.6) 58.5 Positive
  1. VF ventricular fibrillation, VT ventricular tachycardia, PEA pulseless electrical activity, CPR cardiopulmonary resuscitation, ALS advanced life support, ROSC return of spontaneous circulation