Table 2.

Univariate analysis of independent variables for 90 day in-hospital mortality

Variable	OR	P values
Age 40–79 year	2.63 (1.63–4.24)	0.0001
Age ≥80 year	3.20 (1.94–5.27)	<0.0001
Female	0.54 (0.45–0.65)	<0.0001
Systolic blood pressure	0.99 (0.99–0.99)	<0.0001
Heart rate	1.01 (1.01–1.02)	<0.0001
Breathing rate	1.07 (1.05–1.09)	<0.0001
Body temperature	0.90 (0.83–0.98)	0.0143
SaO2	0.96 (0.96–0.97)	<0.0001
Consciousness (non-alert)	1.96 (1.57–2.45)	<0.0001
Supplemental oxygen	1.97 (1.66–2.33)	<0.0001
NEWS	1.14 (1.11–1.16)	<0.0001
Platelet	1.00 (1.00–1.00)	0.0659
Creatinine	0.97 (0.93–1.01)	0.1875
Bilirubin	1.15 (1.12–1.17)	<0.0001
Initial PO2	0.99 (0.99–1.00)	0.0005
PaO2MAX	0.64 (0.51–0.82)	0.0003
PaO2AVG	0.57 (0.45–0.74)	<0.0001
PaO2MED	0.54 (0.42–0.69)	<0.0001
AUC72	1.59 (1.32–1.92)	<0.0001

AUC₇₂, area under the curve divided by elapsed time between ED arrival and the last result of PO₂within 72 hours; NEWS, National Early Warning Score; PaO_2AVG, average value of PO₂ within 72 hours; PaO_2Max, highest value of PO₂within 72 hours; PaO_2MED, median value of PO₂within 72 hours; PO₂, PaO₂of oxygen; SaO₂, oxyhaemoglobin saturation.