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Forest plot of correlation between lung ultrasound and PO2/FiO2. In pooled results, the correlation coefficient was −0.69 (95% −0.75, −0.62). There was significant heterogeneity between the studies as measured by the I2 and Cochran Q test.
CI, confidence interval; PO 2 /FiO 2 , ratio of partial pressure of oxygen in arterial blood to the fraction of inspiratory oxygen concentration.
