Odds of survival in out-of-hospital cardiac arrest
| Factor | Estimated OR for survival | 95% CI | p Value |
| Age (per year older) | 0.97 | 0.95 to 1.0 | 0.03 |
| Rhythm (VF vs other) | 5.57 | 1.44 to 21.6 | 0.01 |
| Response time (per min shorter) | 1.24 | 1.04 to 1.48 | 0.02 |
| Bystander-witnessed arrest (witnessed vs not witnessed) | 1.64 | 0.52 to 5.19 | 0.39 |
| Bystander CPR vs not | 1.32 | 0.46 to 3.80 | 0.60 |
CPR, cardiopulmonary resuscitation; VF, ventricular fibrillation.