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The incidence of ARDS by initial serum lactate level measured in the emergency department. The incidence and upper bound of the 95% confidence interval are presented by categorized serum lactate levels. Serum lactate categorized as: Low = 0 – 1.9 mmol/L, Intermediate = 2 – 3.9 mmol/L, and High = ≥4 mmol/L.
