THBS1 and bronchopulmonary dysplasia: There were also significant differences in airway TSP-1 protein levels between moderate and severe BPD patients [(p = 0.02) (no BPD: 527 (114–1755); moderate BPD: 312 (262–641); and severe BPD 211: (117–352) ng/dL; median (IQR)].