Table 1

Proportion of samples where difference in ΔpCO2 was greater than 5, 7.5 and 10 mm Hg, respectively, for two different sampling methods

Difference in ΔpCO2 valuesCalculated arterial/venous ΔpCO2Calculated arterial/venous ΔpCO2Arterial/venous ΔpCO2Arterial/calculated arterial ΔpCO2
Data set1st data set2nd data set2nd data set2nd data set
>5 mm Hg34/156 (21.8%)17/82 (20.7%)22/82 (26.8%)2/82 (2.4%)
>7.5 mm Hg14/156 (9.0%)10/82 (12.2%)12/82 (14.6%)0/82 (0%)
>10 mm Hg5/156 (3.2%)4/82 (4.9%)4/82 (4.9%)0/82 (0%)
  • pCO2, carbon dioxide partial pressure.