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Table 2 Respiratory variables between survivors and non survivors at days 1 and 2

From: Estimated dead space fraction and the ventilatory ratio are associated with mortality in early ARDS

VariableDay 1Day 2
Survivors n = 652 (QR)Non survivors n = 288 (QR)ORp-valueSurvivors n = 638 (QR)Non survivors n = 253 (QR)ORp-value
PEEP (cmH2O)10 (5–12)10 (6–13)1.25 (1.02–1.53)0.038 (5–12)10 (6–12)1.48 (1.14–1.92)< 0.01
ΔP14 (10–19)17 (11–22)1.73 (1.39–2.14)0.0412 (9–17)15 (11–21)2.26 (1.84–2.80)0.03
PaO2/FiO2206 (154–261)191 (136–255)0.85 (0.71–1.02)0.08214 (160–266)200 (143–245)0.76 (0.63–0.92)< 0.01
Crs (ml/cmH2O)33 (24–50)27 (20–41)0.82 (0.72–0.94)< 0.0140 (28–66)30 (20–50)0.66 (0.56–0.80)0.01
VD/VT
 Harris–Benedict0.6 (0.6–0.7)0.7 (0.6–0.7)1.23 (1.04–1.46)0.010.6 (0.6–0.7)0.7 (0.6–0.7)1.25 (1.05–1.50)0.01
 Penn State0.6 (0.5–0.6)0.6 (0.5–0.7)1.28 (1.07–1.55)< 0.010.6 (0.6–0.7)0.6 (0.5–0.7)1.40 (1.16–1.70)0.01
 Direct0.6 (0.6–0.7)0.7 (0.6–0.8)1.40 (1.18–1.63)0.020.6 (0.6–0.7)0.7 (0.6–0.8)1.56 (1.31–1.85)0.03
VR1.6 (1.4–2)1.8 (1.5–2.3)1.21 (1.05–1.40)< 0.011.7 (1.4–2)1.9 (1.5–2.3)1.30 (1.12–1.51)< 0.01
  1. PEEP positive end-expiratory pressure, ΔP driving pressure, Crs compliance of the respiratory system, PaCO2 partial pressure of carbon dioxide, VD/VT estimated dead space fraction, VR ventilatory ratio