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A chronic lung disorder associated with pulmonary maldevelopment, scarring, and/or inflammation that develops in preterm neonates exposed to supplemental oxygen for at least 28 days. For infants born before 32 weeks gestation with severe BPD, there is a supplemental oxygen requirement of greater than or equal to 30% and/or positive pressure at 36 weeks postmenstrual age or earlier discharge. For infants born after 32 weeks with severe BPD, there is a supplemental oxygen requirement of greater than or equal to 30% and/or positive pressure at 56 days post-natal age or at earlier discharge.
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