Variable | Odds ratio | (95% CI) | p-value |
---|---|---|---|
Weekend mission | 1.67 | (0.90; 3.10) | 0.106 |
Season | Â | Â | Â |
 Winter | 1.00 | (baseline) |  |
 Spring | 0.89 | (0.38; 2.07) | 0.792 |
 Summer | 1.20 | (0.54; 2.66) | 0.655 |
 Fall | 0.71 | (0.27; 1.89) | 0.492 |
Helicopter hoist operation | 0.29 | (0.04; 2.28) | 0.241 |
Remote location | 1.06 | (0.49; 2.26) | 0.890 |
Age in years | 0.95 | (0.90; 1.01) | 0.092 |
Age group | Â | Â | Â |
 < 1 years | 1.00 | (baseline) |  |
 1–6 years | 1.33 | (0.61; 2.92) | 0.474 |
 7–16 years | 0.64 | (0.28; 1.47) | 0.291 |
Sex | Â | Â | Â |
 Male | 1.00 | (baseline) |  |
 Female | 1.14 | (0.63; 2.06) | 0.662 |
Pre-existing co-morbidities | Â | Â | Â |
 Cardiovascular | 1.15 | (0.37; 3.62) | 0.806 |
 Respiratory | 0.42 | (0.05; 3.34) | 0.411 |
 Premature birth | 1.44 | (0.15; 14.07) | 0.756 |
 Neurological | 1.64 | (0.42; 6.40) | 0.475 |
 Syndrome | 0.71 | (0.08; 6.01) | 0.753 |
 Diabetes | - |  |  |
Dispatcher-identified cardiac arrest | 1.43 | (0.79; 2.56) | 0.236 |
Dispatcher-assisted CPR | 0.94 | (0.41; 2.16) | 0.892 |
Witnessed cardiac arrest | 1.79 | (1.00; 3.23) | 0.051 |
Bystander CPR | 8.52 | (2.98; 24.32) | < 0.001 |
ALS before HEMS arrival | 0.74 | (0.40; 1.37) | 0.339 |
Ongoing chest compressions at HEMS arrival | 0.14 | (0.07; 0.27) | < 0.001 |
Use of mechanical CPR device | - | Â | Â |
Resuscitation delay (> 2 min) | 0.18 | (0.09; 0.36) | < 0.001 |
Initial rhythm | Â | Â | Â |
 Asystole | 0.03 | (0.01; 0.10) | < 0.001 |
 Pulseless electrical activity (PEA) | 0.49 | (0.18; 1.31) | 0.154 |
 Shockable rhythm | 1.29 | (0.45; 3.65) | 0.636 |
Number of shocks | 0.69 | (0.34; 1.41) | 0.311 |
Adrenaline | 0.06 | (0.03; 0.13) | < 0.001 |
Tracheal tube | 0.26 | (0.14; 0.48) | < 0.001 |
Transport under ongoing CPR | 0.25 | (0.09; 0.71) | 0.010 |
Traumatic aetiology | 0.09 | (0.03; 0.29) | < 0.001 |
Non-traumatic aetiology | 11.37 | (3.45; 37.45) | < 0.001 |