Table 3:

Multivariable Poisson regression model with good neurological outcome

Variables	Relative Risk	95% CI	p-value
Mean PaCO2	1.50	1.35 – 1.65	<0.001
Mean PaCO2 squared	0.99	0.98 – 0.99	<0.001
VT/VF	2.06	1.69 – 2.50	<0.001
Age*	0.84	0.77 – 0.92	<0.001
Alveolar dead space† (L/min)	0.90	0.84 – 0.97	0.004
Metabolic Acidosis‡	0.60	0.45 – 0.82	0.001
Mean arterial blood pressure (mmHg)	1.02	1.01 – 1.02	<0.001
Percutaneous coronary intervention	1.62	1.26 – 2.09	<0.001

[defined as modified Rankin Scale (mRS) ≤ 3 at hospital discharge] as the dependent variable. Mean partial pressure of arterial carbon dioxide (PaCO₂) during the initial six hours after return of spontaneous circulation entered as a continuous variable calibrated for rise in 5 mmHg.

^*Calibrated for a rise in 10 years

^†Estimated using corrected minute ventilation for normal PaCO₂.

^‡Defined as a base deficit ≤ −6 during the first 6 hours after return of spontaneous circulation.

CI, confidence interval; VT/VF, ventricular tachycardia/ventricular fibrillation. Model has good fit: Deviance test p = 1

Removed for non-significance: cardiac arrest location (p = 0.607); and duration of cardiopulmonary resuscitation (p = 0.500).