Table 5.
Variables | Odds ratio | 95% confidence interval | p value |
Shockable rhythm (VF, VT) | 1.27 | 1.08–1.58 | 0.02 |
Arrival time | 1.32a | 1.24–1.68 | 0.01 |
Witnessed arrest | 7.64 | 2.32–22.42 | < 0.001 |
Bystander CPR | 4.84 | 2.10–10.48 | < 0.001 |
Initial petCO2 b | 18.65 | 6.14–32.27 | < 0.001 |
Average petCO2 b | 2.86 | 1.42–4.65 | < 0.001 |
Final petCO2 b | 2.26 | 1.21–4.13 | 0.012 |
Initial MAPb | 1.06 | 0.82–1.43 | 0.46 |
Final MAPb | 1.79 | 1.28–3.12 | 0.009 |
Vasopressin | 1.34 | 1.14–1.94 | 0.024 |
Period 2c | 1.68 | 1.20–2.94 | 0.008 |
aValue proportional to each one-minute decrease in arrival time; bValues proportional to each increase by 1.33 kPa (10 mm Hg); cCPR performed in the period from November 2003 to April 2006 (period 1: January 2000 to November 2003). CPR, cardiopulmonary resuscitation; MAP, mean arterial blood pressure; petCO2, end-tidal pressure of carbon dioxide.