Table 1.
Original dataset variables.
| Variable | Data type |
| Date | Long date (01/01/1900) |
| Time | HH:MM:SS format |
| Postcode | Standard UK postcode format |
| Aetiology | Cause of cardiac arrest (e.g. cardiac) |
| Age | Number format / Unknown response |
| Sex | Male or female |
| Ambulance response time | HH:MM:SS format |
| PAD used | YES / NO / Unknown response |
| Bystander CPR | YES / NO / Unknown response |
| Witnessed arrest | EMS / Bystander / No / Unknown response |
| DNACPR form | YES / NO / Unknown response |
| Defibrillator used by EMS | YES / NO / Unknown response |
| Initial rhythm | VF and/or VT/ Asystole / PEA / Unknown |
| EMS CPR | YES / NO / Unknown response |
| Advanced airway management | YES / NO / Unknown response |
| ALS drugs | YES / NO / Unknown response |
| ROLE | YES / NO / Unknown response |
| ROSC at any time | YES / NO / Unknown response |
| Leave scene to hospital time | HH:MM:SS format |
| Conveyed to hospital | YES / NO / Unknown response |
| ROSC on arrival at hospital | YES / NO / Unknown response |
| Receiving destination | Hospital name |
| Cardiac arrest witnessed by someone | YES / NO / Unknown response |
| Initial call category: Category 1: life-threatening illness and injury Category 2: emergency or a potentially serious condition Category 3: urgent Category 4: not urgent but needs assessment* |
C1 / C2 / C3 / C4 |
*Taken from Goddard (2022).
ALS: advanced life support; CPR: cardiopulmonary resuscitation; DNACPR: do not attempt cardiopulmonary resuscitation; EMS: emergency medical services; PAD: public access defibrillator; PEA: pulseless electrical activity; ROLE: recognition of life extinct; ROSC: return of spontaneous circulation; VF: ventricular fibrillation; VT: ventricular tachycardia.