Maternal and neonatal data were abstracted from electronic medical records and charts. Antenatal and perinatal data: maternal age, medical conditions, place of birth, corticosteroids administration, mode of delivery, GA at birth, birth weight, sex, delayed cord clamping, invasive ventilation at birth, cord pH, Apgar score at 1 and 5 min.
Prematurity-related clinical morbidities: patent ductus arteriosus (PDA) requiring treatment, sepsis, hypotension requiring inotropes, bronchopulmonary dysplasia (the need for supplemental oxygen at 36 weeks' postmenstrual age), periventricular leukomalacia (PVL).
Ventricular measurements and fNIRS data: 2D cUS GMH-IVH staging (right, left), 3D cUS ventricle volumes (left, right and total), postnatal course during each measurement and resting state fNIRS data. For infants with PHVD, before and after each CSF diversion procedure: head circumference, weight, hemoglobin, respiratory support, tap volume, the need for VP shunt and brain MRI for those infants who went on to have one.
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