aOR	Adjusted Odds Ratio
BPD	Bronchopulmonary Dysplasia
BW	Birth Weight
CI	Confidence Interval
CP	Cerebral Palsy
GA	Gestational Age
HIE	Hypoxic–Ischemic Encephalopathy
IVH	Intraventricular Hemorrhage
K-DST	Korean Developmental Screening Test
NEC	Necrotizing Enterocolitis
NHIS	National Health Insurance Service
PDA	Patent Ductus Arteriosus
PPHN	Persistent Pulmonary Hypertension of the Newborn
PVL	Periventricular Leukomalacia
ROP	Retinopathy of Prematurity
SD	Standard Deviation