Table 3.

Logistic regression models of survival.

Variable	Univariate analysis
	Unadjusted OR	95% CI of OR	Std. Err	p value
CO2 gap, kPa	2.044	1.299–3.219	0.232	0.002
Age, year	1.059	1.030–1.088	0.014	< 0.001
Systolic BP, mmHg	0.998	0.985–1.011	0.007	0.750
Pulse, bpm	1.001	0.984–1.018	0.009	0.909
SpO2, %	0.948	0.875–1.025	0.039	0.171
PaO2, kPa	0.974	0.950–0.998	0.013	0.038
ISS Thorax	1.077	0.796–1.457	0.154	0.629

Variable	Multivariate analysis
	Adjusted OR	95% CI of OR	Std. err	p value
CO2 gap, kPa	2.692	1.283–5.646	0.385	0.009
Age, year	1.063	1.026–1.102	0.018	0.001
Systolic BP, mmHg	1.002	0.986–1.018	0.008	0.822
Pulse, bpm	0.984	0.960–1.009	0.013	0.199
SpO2, %	0.960	0.810–1.137	0.106	0.635
PaO2, kPa	0.966	0.926–1.007	0.022	0.101
ISS thorax	1.030	0.683–1.554	0.214	0.887

Complete case analysis available for 93 patients (multivariate). Twelve patients were excluded from the multivariate analysis due to missing data (see Table 1). Units of measure and abbreviations as described in Tables 1 and 2.