Multivariate logistic regression models investigating the role of gestational age and circumstances at delivery on neonatal outcomes. The following variables were tested as potential confounders: 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
AOR: adjusted OR
The area under receiver operating characteristic (ROC) curve was respectively 0.68 for composite adverse neonatal outcomes, 0.65 for neonatal resuscitation, 0.66 for metabolic complications, and 0.69 for respiratory support.
For details about specific definitions please see table S1 .