International audienceObjectives: In patients with acute hypoxemic respiratory failure, noninvasive ventilation and high-flow nasal cannula oxygen are alternative strategies to conventional oxygen therapy. Endotracheal intubation is frequently needed in these patients with a risk of delay, and early predictors of failure may help clinicians to decide early. We aimed to identify factors associated with intubation in patients with acute hypoxemic respiratory failure treated with different noninvasive oxygenation techniques. Design: Post hoc analysis of a randomized clinical trial. Setting: Twenty-three ICUs. Patients: Patients with a respiratory rate greater than 25 breaths/min and a Pao(2)/Fio(2) ratio less than or equal to 300mm Hg. Interve...