Fig. 2

Kaplan–Meier curves of survival in groups stratified by lactate cutoff levels determined with Youden’s J statistic for area under the ROC curve. a Lactate at 6 h ≤ 3.27 mmol/L; b Lactate at 12 h ≤ 3.15 mmol/L; c Lactate at 24 h ≤ 1.55 mmol/L; d Lactate clearance at 24 h ≥ 46.5%