Table 1. Characteristics of Bystander-Witnessed Out-of-Hospital Cardiac Arrest of Cardiac Origin in 47 Prefectures in Japan, April 2011 to December 2016.
| Characteristic | No. (%) |
|---|---|
| Total No. | 103 189 (100) |
| Patient age, y | |
| <75 | 40 081 (38.8) |
| ≥75 | 63 108 (61.2) |
| Patient sex | |
| Men | 62 795 (60.9) |
| Women | 40 394 (39.1) |
| Season | |
| Warm (May to October) | 46 843 (45.4) |
| Cold (November to April) | 56 346 (54.6) |
| Regiona | |
| East | 59 702 (57.9) |
| Central | 28 646 (27.8) |
| West | 14 266 (13.8) |
| Initial cardiac arrest rhythm of ECG | |
| Shockable rhythmb | 20 848 (20.2) |
| Nonshockable rhythmc | 80 110 (77.6) |
| Unknown | 2231 (2.2) |
| Bystander resuscitation | |
| Present | 54 050 (52.4) |
| Absent | 49 045 (47.5) |
| Unknown | 94 (0.1) |
| Time from collapse to initial ECG, min | |
| <10 | 65 770 (63.7) |
| ≥10 | 37 271 (36.1) |
| Unknown | 148 (0.1) |
Abbreviation: ECG, electrocardiogram.
a
See eTable 1 and eFigure 1 in the Supplement.
b
Indicates ventricular fibrillation and pulseless ventricular tachycardia.
c
Indicates pulseless electrical activity and asystole.