Table 5.
Results of the forward stepwise regression of calculated HCO 3 − as dependent variable versus jugular venous values of the physicochemical variables.
| Order of entry into regression model dS1 | Variable | Partial R 2 | Model R 2 |
|---|---|---|---|
| 1 | SIG | 0.59 | 0.59 |
| 2 | SID3 | 0.34 | 0.93 |
| 3 | Atot | 0.04 | 0.97 |
| 4 | pCO2 | 0.01 | 0.98 |
| Order of entry into regression model DS2 | |||
| 1 | SIG | 0.42 | 0.42 |
| 2 | SID3 | 0.48 | 0.90 |
| 3 | Atot | 0.06 | 0.96 |
| 4 | pCO2 | 0.02 | 0.98 |
DS1, data set 1; DS2, data set 2; HCO3 −, bicarbonate; pCO2, partial carbon dioxide pressure; SID3, strong ion difference; SIG, strong ion gap; Atot, total plasma concentration of nonvolatile weak acids. P < .0001 for all the variables' coeffficients.
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