Fig. 1
Association between birth weight, gestational age and oxygen supplementation in preterm neonates. A There was a significant correlation between gestational age and birth weight among all preterm infants (n = 107). BPD neonates had significantly lower birth weight and gestation age compared to non-BPD. B An inverse association was observed between days of supplemental oxygen (O2) therapy in newborn intensive care unit (NICU) and gestational age in preterm infants. Infants with BPD had more days of O2 supplementation regardless of gestational age compared to non-BPD. Red circles = BPD (n = 14), blue circles = O2 supplementation ≥ 5 days and non-BPD (n = 41). Open circles indicate preterm non-BPD neonates with 1–4 days (n = 21) or with zero (n = 31) supplementation of O2