TABLE 3.
A multiple logistic regression analysis for the primary outcome according to the witnessed status.
| Variables | Witnessed arrest (n = 1016) | Unwitnessed arrest (n = 265) | ||
|---|---|---|---|---|
| Adjusted OR (95% CI) | p value | Adjusted OR (95% CI) | p value | |
| Age, y | 0.96 (0.95–0.98) | <0.001 | 0.98 (0.95–1.00) | 0.172 |
| Male | 0.67 (0.41–1.09) | 0.114 | 0.84 (0.33–2.10) | 0.712 |
| Bystander CPR | 1.83 (1.22–2.75) | 0.006 | 0.81 (0.32–2.03) | 0.661 |
| Initial rhythm on the scene | ||||
| VF/pVT | Reference | Reference | ||
| Pulseless electrical activity | 0.31 (0.17–0.55) | <0.001 | 1.60 (0.59–4.33) | 0.347 |
| Asystole | 0.18 (0.05–0.61) | 0.006 | 1.15 (0.42–3.16) | 0.773 |
| AED use | 1.04 (0.66–1.64) | 0.864 | 0.51 (0.22–1.17) | 0.113 |
| Any ALS care | 0.48 (0.33–0.70) | <0.001 | 0.42 (0.19–0.91) | 0.029 |
Abbreviations: AED, automated external defibrillator; ALS, advanced life support; CI, confidence interval; CPR, cardiopulmonary resuscitation; OR, odds ratio; pVT, pulseless electrical activity; VF, ventricular fibrillation.