Data comparison between the advanced airway management group and the bag-valve-mask ventilation group
| Advanced airway management (n=5893) | Bag-valve-mask (BVM) ventilation (n=6974) | 95% CI | P value | |
| Age (years); median (25–75 percentile) | 76 (64–84) | 74 (60–83) | 0.99 to 1.00 | <0.0001 |
| Gender (% male) | 3599 (61.0) | 4185 (60.0) | 0.89 to 1.03 | 0.2250 |
| Cardiac aetiology (%) | 3116 (52.9) | 3263 (46.8) | 0.73 to 0.84 | <0.0001 |
| Witnessed arrest (%) | 2889 (49.0) | 3333 (47.8) | 0.89 to 1.02 | 0.1670 |
| Bystander CPR (%) | 2245 (38.1) | 2269 (32.5) | 0.73 to 0.84 | <0.0001 |
| Initial rhythm VF/pulseless VT (%) | 468 (7.9) | 442 (6.3) | 0.69 to 0.90 | <0.0001 |
| Confirmed cardiac output on EMS arrival (%) | 114 (1.9) | 272 (3.9) | 1.65 to 2.57 | <0.0001 |
| Good neurological outcome at 1 month (%) | 89 (1.5) | 251 (3.6) | 1.91 to 3.19 | <0.0001 |
CPR, cardiopulmonary resuscitation; EMS, emergency medical services; VF, ventricular fibrillation; VT, ventricular tachycardia.