Average receiving operating characteristics curves of initial blood lactate (A) and base deficit (B). The outcome is in-hospital mortality, defined as death occurring within 30 days after hospital admission or before discharge when discharge occurred within 30 days. P values refer to the comparison of the area under the receiving operating characteristics curves (AUC) versus 0.50 (i.e., no discrimination). The dotted line corresponds to the nondiscrimination curve.