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Kaplan-Meier survival analysis. (A) Kaplan-Meier survival analysis comparing non-ARDS and ARDS groups. (B) Kaplan-Meier survival analysis comparing non-ARDS, mild ARDS, moderate ARDS, and severe ARDS groups. p < 0.001 for all comparisons. The numbers of patients at risk at each time point were shown below the graph. Abbreviations: ARDS, acute respiratory distress syndrome
