Caption to figures.
Figure 1. CONSORT flow chart. *Unknown congenital
immunodeficiency; **prolonged HFNC treatment after PICU admission and
enrollment
Figure 2. Intubation rate at each center.
Figure 3. Trend of pH, PaO2/FiO2, PaCO2, heart rate (HR) and
respiratory rate (RR) between groups. None of the clinical or
respiratory parameters differed significantly between groups; however,
they all showed a significant improvement over time (p<0.001
in all cases)