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(a) Proportion of patients with severe metabolic acidosis (HCO3⁻ ≤ 18 mmol/l, yellow bars), mild-to-moderate metabolic acidosis (HCO3⁻, 18.1–21.9 mmol/l, light green bars) and no metabolic acidosis (HCO3⁻ ≥22 mmol/l, dark green bars). (b) As above, with additional breakdown of mild-to-moderate metabolic acidosis into subgroups (HCO3⁻, 18.1–19 mmol/l; HCO3⁻, 19.1–21 mmol/l; and HCO3⁻, 21.1–21.9 mmol/l). HCO3⁻, serum bicarbonate concentration.
