Figure 2. Incidence of BPD or BPD/Death when the PDA is still persistently moderate-to-large on day 7, day 15 and during the 4^th postnatal week.

The likelihood of developing BPD or BPD/Death is examined in infants whose ductus is constricted by 7 days after birth and compared with those whose PDA is still moderate-to-large at 7 days (see Echo at 7d). Similarly, the likelihood of developing BPD or BPD/Death is examined in infants whose ductus was moderate-to-large at 7 days and was still moderate-to-large at 15 days (see Echo at 5d) or during the 4^th postnatal week (see Echo during 4^th week).