TXN and bronchopulmonary dysplasia: The serum TRX-1 levels on admission were not different between the severe BPD (n = 46) and non-severe BPD groups (n = 67): [median (interquartile range) 147 (73.0–231) vs. 164 (80.5–248) ng/mL] (P = 0.57).