Table 1 Baseline characteristics of patients included in the PaO₂ and PaCO₂ analyses, n = 2135

Age in years, mean (SD)

Male sex, n (%)

 Previous myocardial infarction n (%)

 Chronic heart failure n (%)

 COPD n (%)

 Cerebro vascular disease n (%)

 Diabetes mellitus n (%)

 Obesity n (%)

 Witnessed cardiac arrest n (%)

 Bystander CPR n (%)

 Bystander defibrillation n (%)

 Initial rhythm shockable n (%)

 Time to ROSC (min), median (IQR)

 Sedated on arrival n (%)

 GCS Motor 1 n (%)

 Circulatory shock on admission n (%)

 Admission pH, median (IQR)

 Admission lactate, mmol/l, median (IQR)

 Bicarbonate on admission, mmol/l, median (IQR)