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Respiratory data in 30 patients with VAP and 12 non-VAP subjects. (A) Ratio of the partial pressure of oxygen in arterial blood (PaO2) to the inspired oxygen fraction (FiO2) and (B) Oxygen index in patients developing ventilator-associated pneumonia (square) and non-VAP patients (circle) with mechanical ventilator. *p<0.05, **p<0.01, ***p<0.001 by Mann Whitney U test.
