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

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