[Comment] Data-driven analysis to understand preterm lung disease phenotypes

Bronchopulmonary dysplasia has been used to define the respiratory consequences of preterm birth since 1967.1 Since then, the definition of bronchopulmonary dysplasia has been adapted to account for changes in neonatal intensive care.1 Common to all bronchopulmonary dysplasia definitions is their assessment at a single timepoint, currently 36 weeks post-menstrual age.2 Bronchopulmonary dysplasia is not a singular pathological process, and current definitions do not consider the dynamic changes in respiratory health and treatments before this timepoint.