Table 1.

Definition of patient level variables used in forecasting models

Variable	Variable Type	Definition
Mother’s Age	Non-Negative Integer	The age of the patient’s mother in years on the data of birth
Mother’s Gravidity	Non-Negative Integer	Mother’s total number of pregnancies including admitted patient
Antibiotic Use	Binary	Any identified antibiotic use by patient’s mother, prenatal or during labor
Steroid Use	Binary	Any identified steroid use by patient’s mother, prenatal or during labor
MgSO4 Use	Binary	Any identified Magnesium Sulfate use by patient’s mother, prenatal or during labor
Multiple Gestation	Binary	Admitted patient was one of multiple gestations
Premature Delivery	Binary	Admitted patient was delivered with a gestational age of less than 37 weeks
Delivery Method	Binary	Patient was delivered by vaginal birth or caesarean section
Gestational Age	Non-Negative Integer	The gestational age of the patient in weeks
Birthweight Admission Weight Apgar at 1 Minute Apgar at 5 Minutes Premature Rupture of Membranes Outborn	Non-Negative Integer Non-Negative Integer Non-Negative Integer Non-Negative Integer Binary Binary	The weight of the patient in grams at time of birth The weight of the patient in grams at time of initial admission to NICU Patients Apgar score at 1 minute after birth Patients Apgar score at 5 minutes after birth Rupture of amniotic sac at least 1 hour prior to start mother’s labor Patient born in Christiana Care Health System hospital