Results
From the 13 participating NICUs, 475 infants were eligible for inclusion in the trial. Among them 168 infants (35.4%) were not able to undergo the stability test within day 5 of life and were excluded. The stability test was performed in 307 infants, 247 (80.5%) of whom passed the test and were randomized to the NCPAP arm (n = 122) or the HHHFNC arm (n = 125) (