Table 2. Characteristics of Bystander-Witnessed OHCA of Cardiac Origin by Initial Cardiac Arrest Rhythms.
| Characteristic | No. (%) | P value | |
|---|---|---|---|
| Shockable rhythma | Nonshockable rhythmb | ||
| Total No. | 20 848 | 80 110 | |
| Patient age, y | <.001 | ||
| <75 | 14 454 (69.3) | 24 519 (30.6) | |
| ≥75 | 6394 (30.7) | 55 591 (69.4) | |
| Patient sex | <.001 | ||
| Men | 16 604 (79.6) | 44 765 (55.9) | |
| Women | 4244 (20.4) | 35 345 (44.1) | |
| Season | <.001 | ||
| Warm (May to October) | 10 284 (49.2) | 35 482 (44.3) | |
| Cold (November to April) | 10 564 (50.7) | 44 628 (55.7) | |
| Regionc | <.001 | ||
| East | 11 661 (56.4) | 46 625 (58.5) | |
| Central | 6007 (29.0) | 22 104 (27.7) | |
| West | 3027 (14.6) | 10 974 (13.8) | |
| Bystander resuscitation | <.001 | ||
| Present | 12 075 (58.0) | 40 446 (50.5) | |
| Absent | 8736 (42.0) | 39 618 (49.5) | |
| Time from collapse to initial ECG, min | <.001 | ||
| <10 | 14 689 (70.5) | 49 473 (61.8) | |
| ≥10 | 6138 (29.5) | 30 515 (38.2) | |
Abbreviation: ECG, electrocardiogram.
a
Indicates ventricular fibrillation and pulseless ventricular tachycardia.
b
Indicates pulseless electrical activity and asystole.
c
See eTable 1 and eFigure 1 in the Supplement.