Table 4.
Variables associated with restoration of spontaneous circulation and hospital admission
| Variables | Odds ratio | 95% confidence interval | p value |
| Shockable rhythm (VF, VT) | 2.11 | 1.14–2.87 | 0.016 |
| Arrival time | 1.38a | 1.07–2.55 | 0.008 |
| Witnessed arrest | 1.27 | 0.76–1.94 | 0.54 |
| Bystander CPR | 2.43 | 1.21–4.98 | 0.014 |
| Initial petCO2 b | 20.35 | 5.43–35.63 | <0.001 |
| Average petCO2 b | 6.36 | 2.30–8.34 | <0.001 |
| Final petCO2 b | 2.85 | 1.43–3.92 | 0.003 |
| Initial MAPb | 1.25 | 1.13–1.86 | 0.02 |
| Vasopressin | 1.63 | 1.24–2.14 | 0.012 |
| Gender (female) | 2.85 | 1.36–5.48 | 0.002 |
| Period 2c | 1.28 | 1.15–1.92 | 0.02 |
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; VF, ventricular fibrillation; VT, ventricular tachycardia without pulse.