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Kaplan-Meier 12-month survival analysis based on lactate clearance quartile. Lactate clearance quartile 1, 2, 3, and 4 have lactate clearance of -24.3 ± 42.3, 30.1 ± 7.5, 53.4 ± 6.6, and 75.1 ± 7.1%, respectively, during the first 6 hours in the emergency department (p < 0.01).
