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Patient demographics. Gestational age (GA) at birth and at sample collection time, birth weight, and fraction of inspired oxygen (FiO2) in mild/moderate (Mild/Mod.) and severe bronchopulmonary dysplasia (BPD) infants enrolled. No differences are observed between groups for GA or birth weight parameters. The FiO2 at sample collection time is significantly higher in the severe BPD group when compared to the Mild/Mod. BPD group (unpaired t-test, * p = 0.0104).
