Variable | Univariate | Multivariate | |||||
---|---|---|---|---|---|---|---|
χ2 | d.f. | P-value | χ2 | d.f. | p-value | ||
Age | 3082.7 | 3 | <0.001 | 814.3 | 3 | <0.001 | |
Heart rate | 122.8 | 3 | <0.001 | 79.4 | 3 | <0.001 | |
Systolic blood pressure | 425.3 | 3 | <0.001 | 107.7 | 3 | <0.001 | |
Oxygen saturation | 3502.1 | 3 | <0.001 | 242.9 | 3 | <0.001 | |
Time to HEMS arrival | 80.5 | 3 | <0.001 | 8.9 | 3 | 0.030 | |
GCS | 6827.7 | 2 | <0.001 | 1759.2 | 2 | <0.001 | |
Cardiac rhythm: VF, VT, asystole, or PEA | 6613.3 | 1 | <0.001 | 350.8 | 1 | <0.001 | |
Mission located in medical facility or nursing home, yes | 108.4 | 1 | <0.001 | 0.7 | 1 | 0.408 | |
HEMS vehicle, ground unita | 11.6 | 1 | <0.001 | 0.6 | 1 | 0.444 | |
Sex, male | 39.7 | 1 | <0.001 | 1.0 | 1 | 0.325 | |
Patient category | Trauma | 21.0 | 1 | <0.001 | 1.5 | 1 | 0.220 |
Cardiac arrest | 871.8 | 1 | <0.001 | 7.4 | 1 | 0.007 | |
Neurologicalb | 38.9 | 1 | <0.001 | 10.9 | 1 | <0.001 | |
Psychiatric or intoxication | 35.7 | 1 | <0.001 | 120.9 | 1 | <0.001 | |
Other | 34.8 | 1 | <0.001 | 1.8 | 1 | 0.185 | |
Stroke | 264.7 | 1 | <0.001 | 13.7 | 1 | <0.001 | |
Respiratory failure | 70.2 | 1 | <0.001 | 0.2 | 1 | 0.664 | |
Chest pain | 1.8 | 1 | 0.186 | 0.0 | 1 | 0.876 |