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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