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Forest plot of (A) safe apnea time (second), (B) arterial desaturation during intubation, (C) lowest peripheral capillary oxygen saturation during intubation (%), and (D) patient comfort score (numeric rating scale, 0–10) between HFNO and FMO groups. CI = confidence interval, FMO = facemask oxygenation, HFNO = high-flow nasal oxygenation, M–H = Mantel–Haenszel.
