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Table 3 Results of multivariate logistic regression analyses for variables associated with 1-month outcomes

From: Neurological outcomes in patients transported to hospital without a prehospital return of spontaneous circulation after cardiac arrest

  Adjusted odds ratio (95% CI)
Variables One-month survival One-month CPC 1 to 2
Year
 2007 Reference Reference
 2008 1.04 (0.97, 1.11) 1.12 (0.98, 1.28)
 2009 1.03 (0.97, 1.11) 1.07 (0.93, 1.22)
 2010 1.15 (1.07, 1.24) 1.15 (1.00, 1.31)
Age, years
 < 65 2.13 (1.97, 2.30) 3.90 (3.28, 4.67)
 65 to 85 1.59 (1.48, 1.71) 2.00 (1.69, 2.40)
 > 85 Reference Reference
Male 0.89 (0.85, 0.94) 0.95 (0.86, 1.06)
Arrest witnessed by any layperson 2.15 (2.04, 2.28) 1.90 (1.69, 2.13)
Arrest witnessed by EMS personnel 1.73 (1.60, 1.86) 2.82 (2.48, 3.19)
Bystander CPR 1.00 (0.96, 1.05) 1.04 (0.95, 1.14)
Presumed cardiac cause 0.87 (0.83, 0.91) 1.41 (1.26, 1.57)
Initial cardiac rhythm
 Ventricular fibrillation 5.50 (4.96, 6.10) 9.37 (7.71, 11.4)
 Pulseless ventricular tachycardia 4.58 (3.40, 6.05) 8.50 (5.36, 12.9)
 Pulseless electrical activity 2.38 (2.24, 2.52) 2.75 (2.40, 3.15)
 Asystole Reference Reference
Prehospital actual shock delivery 1.40 (1.28, 1.54) 1.61 (1.35, 1.91)
Use of advanced airway management 1.14 (1.07, 1.20) 0.79 (0.71, 0.89)
Epinephrine administration 0.97 (0.89, 1.05) 0.79 (0.67, 0.94)
Physician-staffed ambulance 1.46 (1.28, 1.65) 1.68 (1.35, 2.07)
Call-to-response time, minutes
 < 5 1.29 (1.18, 1.41) 1.67 (1.40, 2.00)
 5 to 9 1.24 (1.15, 1.34) 1.46 (1.25, 1.71)
 > 9 Reference Reference
Call-to-hospital arrival time, minutes
 < 24 3.19 (2.93, 3.46) 2.58 (2.21, 3.01)
 24 to 37 1.74 (1.62, 1.88) 1.37 (1.19, 1.58)
 > 37 Reference Reference
  1. CPC, cerebral performance category; CPR, cardiopulmonary resuscitation; EMS, emergency medical service.