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Table 2 Results of multivariate logistic regression analyses for variables associated with outcomes a

From: Prognostic implications of conversion from nonshockable to shockable rhythms in out-of-hospital cardiac arrest

Variables

Adjusted OR (95% CI)

Prehospital ROSC

1-month survival

1-month CPC category 1 or 2

Year

      

2005

Reference

Reference

Reference

2006

1.04

(0.99 to 1.10)

1.04

(0.98 to 1.10)

0.99

(0.89 to 1.12)

2007

1.04

(0.99 to 1.10)

1.06

(0.99 to 1.12)

1.24

(1.10 to 1.40)

2008

1.04

(0.99 to 1.10)

1.01

(0.96 to 1.08)

1.27

(1.12 to 1.43)

2009

1.08

(1.03 to 1.13)

1.07

(1.01 to 1.14)

1.49

(1.32 to 1.68)

2010

1.13

(1.08 to 1.19)

1.15

(1.08 to 1.21)

1.55

(1.38 to 1.75)

Ageb

0.99

(0.99 to 0.99)

0.99

(0.99 to 0.99)

0.98

(0.98 to 0.98)

Male

0.92

(0.89 to 0.94)

0.94

(0.91 to 0.97)

0.93

(0.92 to 0.94)

Witnessed OHCA

2.24

(2.17 to 2.31)

2.27

(2.18 to 2.35)

2.76

(2.54 to 3.01)

Witnessed OHCA by EMS personnel

1.18

(1.13 to 1.24)

1.40

(1.33 to 1.48)

2.11

(1.94 to 2.30)

Bystander CPR

1.09

(1.06 to 1.13)

0.99

(0.96 to 1.03)

0.88

(0.81 to 0.95)

Presumed cardiac cause

0.56

(0.55 to 0.58)

0.71

(0.69 to 0.74)

1.28

(1.20 to 1.37)

Initial cardiac rhythm

      

Pulseless electrical activity

3.58

(3.48 to 3.69)

3.06

(2.95 to 3.17)

5.18

(4.78 to 5.61)

Asystole

Reference

Reference

Reference

Call-to-response timeb

1.00

(0.99 to 1.00)

1.00

(1.00 to 1.00)

0.93

(0.92 to 0.94)

Shock deliveryc

      

No

Reference

Reference

Reference

Yes (<10 min)

4.06

(3.47 to 4.75)

4.7

(3.99 to 5.53)

6.55

(5.21 to 8.22)

Yes (10 to 19 min)

1.73

(1.59 to 1.88)

2.16

(1.98 to 2.37)

2.97

(2.58 to 3.43)

Yes (20 to 29 min)

0.92

(0.83 to 1.03)

0.87

(0.76 to 1.01)

0.97

(0.73 to 1.27)

Yes (≥30 min)

1.02

(0.90 to 1.16)

0.77

(0.63 to 0.95)

0.82

(0.53 to 1.25)

Epinephrine administrationd

      

No

Reference

Reference

Reference

Yes (<10 min)

7.44

(6.97 to 7.93)

1.71

(1.53 to 1.91)

0.85

(0.64 to 1.11)

Yes (10 to 19 min)

5.53

(5.29 to 5.78)

1.23

(1.14 to 1.33)

0.48

(0.36 to 0.65)

Yes (≥20 min)

3.73

(3.50 to 3.98)

0.74

(0.65 to 0.84)

0.49

(0.40 to 0.61)

  1. aCI, Confidence interval; CPC, Cerebral Performance Categories scale; CPR, Cardiopulmonary resuscitation; EMS, Emergency medical services; OHCA, Out-of-hospital cardiac arrest; OR, Odds ratio; ROSC, Return of spontaneous circulation. bAdjusted odds ratios are reported for unit odds. cIf shock was received, variables were divided into four categories according to the time from the initiation of CPR by EMS personnel to the first shock delivery (shock delivery time). dIf prehospital epinephrine was received, variables were divided into three categories according to the time from the initiation of CPR by EMS personnel to the first epinephrine administration (epinephrine administration time).
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