Multivariate logistic regression models investigating the role of maternal conditions (diabetes mellitus, hypertensive disorders, liver disorders), fetal characteristics (non-reassuring fetal status, IUGR, prenatally diagnosed fetal anomalies or aneuploidies, and amniotic fluid disorders), pregnancy complications (pPROM, spontaneous PTL, chorioamnionitis, vaginal bleeding from placental abruption or abnormal placentation) on neonatal outcomes. To control for confounding, the following variables were tested in each model: maternal age, parity, previous preterm birth, race, education, BMI, excessive wait gain, smoking, utilization of assisted reproductive technologies, treatment with LDA, progesterone, or LMWH, antenatal corticosteroids
The area under receiver operating characteristic (ROC) curve was respectively 0.71 for composite adverse neonatal outcomes, 0.62 for neonatal resuscitation, 0.64 for metabolic complications, and 0.72 for respiratory support.
AOR: adjusted OR
For details about specific definitions please see table S1 .