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Table 2 Mortality and ventilator-free days across severity categories

From: P/FP ratio: incorporation of PEEP into the PaO2/FiO2 ratio for prognostication and classification of acute respiratory distress syndrome

  P/F ratio P/FP ratio
Outcomes Severe (≤ 100) N = 640 MoNderate (101–200)
N = 1,928
Mild (201–300) N = 839 P value for trend Severe (≤ 100) N = 794 Moderate (101–200)
N = 1,252
Mild (201–300)
N = 640
P value for trend
Hospital mortality, N (%) 295 (46.1) 549 (28.5) 204 (24.3)  < 0.001 340 (42.8) 358 (28.6) 161 (25.1)  < 0.001
Ventilator-free days (IQR) 3 (0–17) 17 (0–22) 21 (1.25–24)  < 0.001 1.5 (0–17) 17 (0–22) 19 (0–23)  < 0.001
  1. P values refer to comparisons of hospital mortality and ventilator-free days between patients classified as having severe, moderate, and mild ARDS.  IQR  interquartile range, P/F =ratio of the PaO2 to FiO2; P/FP = (PaO2 * 10)/(FiO2 * PEEP)