Table 2.
Results of the linear regression analyses between measured and calculated [H+] and [TCO2] for the graphs presented in Figure 8.
| [H+] | n | R2 | SEE | p |
|---|---|---|---|---|
| Arterial | ||||
| [H+] temp adj = 0.697 + (0.982 × [H+] meas) | 82 | 1.000 | 0.053 | <0.001 |
| [H+] ion stewart = 6.759 + (0.867 × [H+] meas) | 82 | 0.517 | 3.217 | <0.001 |
| [H+] ion stewart = 6.068 + (0.886 × [H+] temp adj) | 82 | 0.520 | 3.208 | <0.001 |
| Mixed venous | ||||
| [H+] temp adj = 0.522 + (0.987 × [H+] meas) | 68 | 1.000 | 0.048 | <0.001 |
| [H+] stewart = 22.108 + (0.469 × [H+] meas) | 68 | 0.208 | 3.269 | <0.001 |
| [H+] stewart = 21.734 + (0.479 × [H+] temp adj) | 68 | 0.211 | 3.263 | <0.001 |
| TCO2 | ||||
| Arterial | ||||
| TCO2 temp adj = 17.746 + (0.377 × TCO2 meas) | 82 | 0.219 | 1.516 | <0.001 |
| TCO2 stewart = 27.334 + (0.0693 × TCO2 meas) | 82 | 0.00418 | 2.272 | 0.564 |
| TCO2 stewart = 22.390 + (0.242 × TCO2 temp adj) | 82 | 0.0331 | 2.239 | 0.102 |
| Mixed venous | ||||
| TCO2 temp adj = 13.549 + (0.582 × TCO2 meas) | 68 | 0.172 | 3.148 | <0.001 |
| TCO2 = 0.00678 + (0.000782 × TCO2 meas) | 68 | 0.271 | 0.003 | <0.001 |
| TCO2 stewart = 0.0153 + (0.000522 × TCO2 temp adj) | 68 | 0.381 | 0.003 | <0.001 |
meas = measured at instrument temperature of 37 °C; temp adj = pco2 adjusted to measured blood temperature; stewart = calculated using the ACID-BASICS software.