Table 1.

definition of BPD according to Jobe and Bancalari

Gestational age	< 32 weeks	> 32 weeks
Time point assessment	36 wks PMA* or DC** to home, whichever comes first	> 28 days but < 56 days of life or discharge to home, whichever comes first
Treatment with oxygen > 21% for at least 28 days PLUS
Mild BPD	On room air at 36 wks PMA or at DC, whichever comes first	On room air at day 56 postnatal age or DC, whichever comes first
Moderate BPD	< 30% O2 at 36 wks PMA or DC, whichever comes first	< 30% O2 at 56 d of life or DC whichever comes first
Severe BPD	≥ 30% O2 and/or pos. pressure at 36 wks PMA or DC whichever comes first	≥ 30% O2 and/or pos. pressure at 56 d of life or DC whichever comes first

*PMA = post-menstrual age

**DC = discharge