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