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SpO2/FIO2 and ROX index after initiation of FIO2 ≥ 0.4 between the two groups based on prone therapy. (a) changes in SpO2/FIO2 and (b) changes in ROX index; red line, prone group; blue line, non-prone group. Data are estimated mean and 95% confidence interval. FIO2, fraction of inspired oxygen. *, p < 0.05 of inter-group comparison. **, p < 0.01 of inter-group comparison.
