Fig. 1From: Early prediction of spontaneous Patent Ductus Arteriosus (PDA) closure and PDA-associated outcomes: a prospective cohort investigationInpatient Ductal Patency by Gestation over Time. 50% patent ductus arteriosus (PDA) prevalence in preterm infants (n=244): 23-24 weeks (113 d); 25-27 weeks (82 d); 28-29 weeks (30 d). Log-rank test, p=0.0003Back to article page