Scoring system of prediction model
| Factor | Value |
| Age-adjusted Charlson Comorbidity Index ≤5 | +2 |
| Time to first return of spontaneous circulation ≤40 min | +2 |
| Immediate bystander cardiopulmonary resuscitation | +1 |
| Shockable rhythm | +1 |
| Maximum score attainable | 6 |