Fig. 6From: High-flow nasal cannula oxygen therapy is superior to conventional oxygen therapy but not to noninvasive mechanical ventilation on intubation rate: a systematic review and meta-analysisComparison of secondary outcomes in patients who received high-flow nasal cannula oxygen (HFNC) compared to conventional oxygen therapy (COT). a Effect on the rate of mechanical ventilation. b Effect on the rate of escalation of respiratory support. c Effect on mortality. CI confidence interval, M-H Mantel-HaenszelBack to article page