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Table 2 The Berlin Definition of ARDS categorizes patients according to the severity of their oxygenation deficit; increasing severity is associated with increased mortality [1]

From: ARDS Subphenotypes: Understanding a Heterogeneous Syndrome

Severity PaO2:FiO2 ratio (mmHg) Patients (%) Mortality (%)
Mild 201–300 22 27
Moderate 101–200 50 32
Severe ≤100 28 45