Compared with NCPAP, the infants assisted by BiPAP had a statistically significant reduction in the number of severe apnea 0 (0 - 3) versus 2.5 (0 - 10) episodes per day, p = 0.004; in the number of severe retraction as 2 (14.3%) versus 9 (64.3%), p = 0.016 and FiO2 37.5% (25 - 60) compared to 60% (30 - 80), p = 0.006; Z = - 2, 765.