To the Editor.—

Once again, a study of bronchopulmonary dysplasia (BPD), this time assessing the effect of antenatal steroid therapy, has timed the criteria for diagnosis (oxygen requirement and radiographic changes) at 28 postnatal days.1 Unfortunately, oxygen requirement, with or without radiographic changes, at this age, is being accepted widely as the clinical definition of this condition (alternatively termed chronic lung disease).2,3 Frequently, clinical studies relate minimally, if at all, to the later outcome of infants with BPD.

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