Table 1.
Multiple linear regression model for the ratio of venoarterial PCO2 to arteriovenous oxygen content difference (Pv–aCO2/Ca–vO2)
| Pv–aCO2/Ca–vO2 | Coefficient | Standard error | t ratio | P value | [95% confidence interval] |
|---|---|---|---|---|---|
| Ln hemoglobin (g/dL) | −3.60 | 0.26 | −13.62 | <0.000001 | −4.13 −3.08 |
| Respiratory quotient | 2.43 | 1.03 | 2.35 | <0.03 | 0.37 4.49 |
| Base excess (mEq/L) | −0.06 | 0.03 | −2.42 | <0.02 | −0.12 −0.01 |
| Mixed venous O2 saturation (fraction) | 0.03 | 0.01 | 3.90 | <0.0003 | 0.01 0.04 |
| Mixed venous PCO2 (mmHg) | 0.15 | 0.03 | 4.58 | <0.00003 | 0.08 0.21 |
| Intercept | −0.98 | 1.72 | −0.57 | 0.57 | −4.40 2.44 |