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Table 2 Distribution and outcomes of each subset of patients with ARDS at initial diagnosis and after 24 h

From: Risk stratification using SpO2/FiO2 and PEEP at initial ARDS diagnosis and after 24 h in patients with moderate or severe ARDS

Outcome Group I Group II Group III Group IV P value
SpO2/FiO2 ≥ 190 and PEEP < 10 SpO2/FiO2 ≥ 190 and PEEP ≥ 10 SpO2/FiO2 < 190 and PEEP < 10 SpO2/FiO2 < 190 and PEEP ≥ 10
At onset of ARDS (N) 87 43 100 226  
ICU mortality (%) 19.5 23.3 18.0 30.1 0.042
In-hospital mortality (%) 44.8 30.2 36.0 41.2 0.897
30-day mortality (%) 27.6 27.9 24.0 33.2 0.276
90-day mortality (%) 47.1 34.9 41.0 42.0 0.636
1-year mortality (%) 60.9 41.9 47.0 49.6 0.182
VFD (days) (IQR) 19 (7–24) 22 (6.5–25) 20.5 (6–25) 18 (0–23) 0.070
After 24 h (N) 213 145 17 81  
ICU mortality (%) 15.5 24.1 35.3 48.2 < 0.001
In-hospital mortality (%) 34.7 35.9 52.9 56.8 < 0.001
30-day mortality (%) 23.9 26.9 47.1 45.7 < 0.001
90-day mortality (%) 38.0 38.6 52.9 56.8 0.003
1-year mortality (%) 47.4 45.5 58.8 65.4 0.006
VFD 28 (days) (IQR) 23 (15–26) 18 (0–23) 6 (0–17) 0 (0–17) < 0.001
  1. VFD-28 ventilator-free days and alive at day 28, IQR interquartile range, CI confidence interval