Table 3 The areas under the receiver operating characteristic curve (AUROC) of the different markers of acid-base disorders at ICU admission, with and without combining with Admission Mortality Prediction Model (MPM0 III) predicted risks of mortality, in differentiating between hospital survivors and non-survivors (n = 6878)
Acid-base markers | Mean AUROC (95 % confidence interval [CI]) | |
|---|---|---|
Without MPM0 III | With MPM0 III | |
1. Arterial pH | 0.655 (0.633–0.677) | 0.805 (0.789–0.821) |
2. Arterial CO2 tension | 0.521 (0.499–0.544) | 0.798 (0.782–0.814) |
3. Actual bicarbonate conc. | 0.676 (0.655–0.696) | 0.812 (0.796–0.828) |
4. Chloride conc. | 0.517 (0.495–0.539) | 0.801 (0.785–0.816) |
5. Lactate conc. | 0.701 (0.682–0.721) | 0.824 (0.809–0.839) |
6. Actual base excess | 0.685 (0.664–0.706) | 0.813 (0.797–0.829) |
7. Anion gap | 0.660 (0.639–0.680) | 0.813 (0.798–0.828) |
8. Anion gap albumin-corrected | 0.665 (0.645–0.686) | 0.818 (0.803–0.833) |
9. Strong ion gap (SIG) with lactate | 0.631 (0.611–0.652) | 0.812 (0.797–0.827) |
10. SIG without lactate | 0.521 (0.500–0.542) | 0.801 (0.786–0.817) |
11. Strong ion difference-effective | 0.634 (0.613–0.655) | 0.809 (0.794–0.825) |
12. Other unmeasured ions | 0.679 (0.658–0.700) | 0.820 (0.805–0.835) |