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Table 1 Correlations (Spearman ρ) between VR, PFr, SFr and OI

From: Relation between PaO2/FiO2 ratio, SpO2/FiO2 ratio, oxygenation index and ventilation ratio in critically ill patients

  PFr SFr OI
VR -0.326* -0.325* 0.373*
PFr - 0.759* -0.939*
SFr - - -0.773*
*P < 0.01.