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To investigate the effect of pathological staging of chorioamnionitis (CA) on complications in preterm infants; METHODS A single-center, retrospective study was conducted to choose singleton preterm infants (gestational age 37 weeks) from the Department of Obstetrics and Gynecology in our hospital from December 2016 to December 2017. The basic data and placental pathological results were retrospectively collected. According to the placental pathological results of whether inflammation infiltrating amnion, CA 0/I phase wa