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Table 1 Baseline characteristics of 456 survivors and non-survivors with moderate and severe ARDS

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

Variables All patients Survivors
N = 275
Non-survivors
N = 181
P value
Age, years 62 (51–72) 60 (48–70) 63 (55–72) 0.008
Female   113 (41.1) 59 (32.6) 0.075
Weight, kg 80 (70–90) 80 (70–90) 80 (68–87) 0.347
APACHE IV 68 (51–89) 72 (58–95) 90 (74–113) < 0.001
Charlson comorbidity index 2 1 (0–3) 1 (0–2) 1 (0–3) 0.103
Lung Injury Prediction Score 8.5 (7–10) 8 (6.5–10) 9 (7–10) 0.074
Tidal volume, ml/kg 6.3 (5.3–7.6) 6.3 (5.3–7.8) 6.3 (5.4–7.3) 0.412
Respiratory rate 23 (17–29) 20 (16–27) 25 (19–30) 0.001
PEEP, cmH2O 10 (8–12) 10 (8–12) 10 (8–13) 0.436
FiO2, % 60 (50–75) 60 (50–70) 60 (50–80) 0.462
Arterial pH 7.34 (7.26–7.41) 7.35 (7.28–7.41) 7.31 (7.22–7.39) 0.001
PaCO2, kPa 5.8 (5.1–6.9) 5.7 (5–6.9) 6 (5.2–7.3) 0.072
PaO2/FiO2 120 (89–149) 123 (91–149) 115 (89–149) 0.353
SpO2/FiO2 160 (126–190) 163 (127–191) 157 (124–190) 0.344
Vasopressor use in first 24 h 293 (64.3) 164 (59.6) 129 (71.3) 0.015
ARDS class
 Moderate ARDS 300 (65.8) 181 (65.8) 119 (65.7) 1
 Severe ARDS 156 (34.2) 94 (34.2) 62 (34.3) 1
Cause of ARDS
 Pulmonary origin 325 (71.3) 200 (72.7) 125 (69.1) 0.732
 Non-pulmonary origin 185 (40.6) 104 (37.8) 81 (44.8) 0.382
  1. Categorical variables: number (percentage); continuous variables: median (25–75 percentile)
  2. PEEP positive end-expiratory pressure, FiO2 fraction of inspired oxygen, PaCO 2 arterial carbon dioxide tension, PaO 2 arterial oxygen tension, SpO 2 pulse oximetry saturation, ARDS acute respiratory distress syndrome, APACHE IV acute physiology and chronic evaluation IV