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The proportions of the severity of bronchopulmonary dysplasia (BPD) according to birth weight and gestational age. (A) For very low birth weight infants with a birth weight less than 1,500 g. (B) For preterm infants born before 32 weeks' gestational age. The severity of BPD was defined according to the National Institute of Child Health and Human Development (NICHD) consensus definition (8).
