Fig. 2From: Neonatal respiratory morbidity following exposure to chorioamnionitisIncidence of bronchopulmonary dysplasia (Panels a & b) and composite bronchopulmonary dysplasia and perinatal mortality (Panels c & d) using the traditional (Panels a & c) and fetuses-at-risk (Panels b & d) approach. Washington State Preterm Births 2002–2011 n = 56,537Back to article page