Summary statistics for study population of out-of-hospital patients who experienced cardiac arrest in Korea, 2012–2016
| Variables | Number | (%) | |
| Overall | 38 928 | (100%) | |
| Sex | Male | 24 502 | (62.9%) |
| Female | 14 426 | (37.1%) | |
| Age group, years | <19 | 469 | (1.2%) |
| 19–29 | 506 | (1.3%) | |
| 30–39 | 1118 | (2.9%) | |
| 40–49 | 3000 | (7.7%) | |
| 50–59 | 5824 | (15.0%) | |
| 60–69 | 6572 | (16.9%) | |
| 70–79 | 10 607 | (27.2%) | |
| ≥80 | 10 832 | (27.8%) | |
| Median (IQR) | 72 (58–81) | ||
| Region | Seoul | 15 367 | (39.5%) |
| Inchon | 5087 | (13.1%) | |
| Daejeon | 2363 | (6.1%) | |
| Gwangju | 1926 | (4.9%) | |
| Daegu | 4335 | (11.0%) | |
| Ulsan | 1582 | (4.1%) | |
| Busan | 6180 | (15.9%) | |
| Jeju | 2086 | (5.4%) | |
| Place of event occurrence | Public | 5794 | (14.9%) |
| Private | 29 823 | (76.6%) | |
| Other | 412 | (1.1%) | |
| Unknown | 2899 | (7.4%) | |
| Witness | Yes | 19 315 | (49.6%) |
| No | 17 683 | (45.4%) | |
| Unknown | 1930 | (5.0%) | |
| Bystander CPR | Yes | 6436 | (16.5%) |
| No | 5094 | (13.1%) | |
| Unknown | 27 398 | (70.4%) | |
| Primary ECG | VF/VT | 4044 | (10.4%) |
| PEA | 2184 | (5.6%) | |
| Asystole | 11 149 | (28.6%) | |
| Bradycardia | 79 | (0.2%) | |
| Other/Unknown | 21 472 | (55.2%) | |
| Defibrillation in the ER | Yes | 7534 | (19.4%) |
| No | 31 394 | (80.6%) | |
| Outcomes | P-ROSC | 2606 | (6.7%) |
| Survival to discharge | 3141 | (8.1%) | |
| Good CPC | 1967 | (5.0%) | |
| Death | 31 214 | (80.2%) |
CPC, cerebral performance category 1 or 2; CPR, cardiopulmonary resuscitation; ER, emergency room; PEA, pulseless electrical activity; P-ROSC, prehospital return of spontaneous circulation; VF, ventricular fibrillation; VT, ventricular tachycardia.