Table 1.

Definition of BPD: Diagnostic criteria.

Gestataional age	<32 week	≥32 week
Time point of assessment	36 week PMA or discharge to home, whichever comes first	>28 day but <56 day postnatal age or discharge to home, whichever comes first
Treatment with oxygen >21% for at least 28 d plus
Mild	Breathing room air at 36 week PMA or discharge, whichever comes first	Breathing room air by 56 day postnatal age or discharge, whichever comes first
Moderate	Need for <30% at 36 week PMA or discharge, whichever comes first	Need for <30% at 56 day postnatal age or discharge, whichever comes first
Severe BPD	Need for ≥30% oxygen and/or positive pressure (PPV or NCPAP) at 36 week PMA or discharge, whichever comes first	Need for ≥30% oxygen and/or positive pressure (PPV or NCPAP) at 56 day postnatal age or discharge, whichever comes first

BPD, bronchopulmonary dysplasia; NCPAP, nasal continuous positive airway pressure; NIH, National Institutes of Health; PMA, postmenstrual age; PPV, positive pressure ventilation. Source: Jobe AH, Bancalari E. Bronchopulmonary dysplasia. Am J Respir Crit Care Med 2001;163(07):1723–1729.