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Forest plot comparing oxygenation between HFNC and control groups.
Abbreviations: HFNC, high flow nasal cannula; NIV, non-invasive ventilation; COT, conventional oxygen therapy; PaO2, partial arterial oxygen pressure; FiO2, the fraction of inspired oxygen; green squares, the mean difference value for an individual study result; black diamonds, the overall effect size for study results of the group; IV, Inverse variance method; CI, confidence interval; SD, standard deviation.
