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(A) Comparisons of P/F ratios from ICU admission to 48 hours between patients with ≥ 48 hours and < 48 hours of mechanical ventilation. (B) P/F ratios from ICU admission to 48 hours between patients who developed acute lung injury (24-hour P/F ratio < 300) compared with those who did not.
Note: Data are presented as median, IQR; * represents a statistically significant interval difference (p-value < 0.05) between groups.
Abbreviation: P/F ratio, PaO2/FiO2 ratio, POD, postoperative day
