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Fig. 3B —Correlation between PaO₂ and SD, skewness, kurtosis, and P ± 50 H in patients with pulmonary embolism. Scatterplots show significant correlation between PaO₂ and SD (A) (r = -0.770, p = 0.001), PaO₂ and skewness (B) (r = 0.797, p < 0.0001), PaO₂ and kurtosis (C) (r = 0.786, p < 0.0001), and PaO₂ and P ± 50 H (D) (r = -0.871, p < 0.0001).