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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).