Table 1.

Secondary outcomes

Neonatal morbidities	Bronchopulmonary dysplasia as defined by Walsh [29] Intraventricular hemorrhage ≥ Grade 3 and cystic periventricular leukomalacia as diagnosed by ultrasound [30] NEC ≥ Stage 2 [31] ROP ≥ Stage 3 or treatment of ROP
Growth	Weight gain (g/kg/d) from admission to 36 + 0/40 + 0 weeks (cGA) Z- Scores for weight, length and head circumference at 36 + 0 weeks, 40 + 0 weeks, and 3, 12 and 24 months (cGA)
Nutrition	Day of Life (DOL) of achievement of full enteral feeds defined as 150 ml/kg/d for 3 consecutive days Removal of iv access (DOL) Removal of nasogastric tube (cGA) Breast milk nutrition (Percentage of breast milk within DOL 1–14, DOL with first breast milk feed, DOL with full breast milk feed, breast milk proportion at discharge, fully breastfed at discharge
Respiratory support	End of Continuous Positive Airway Pressure (CPAP) End of Highflow Nasal Cannula (HFNC) End of oxygen supplementation
GA at start of rooming- in
Neurodevelopmental long-term outcome	Neuropsychological Developmental Screening (Neuropsychologische Entwicklungsscreening, NES, 2005) at 12 months cGA Bayley Scales of Infant Development, 3rd Edition, German Version, at 24 months of cGA Gross Motor Function Classification System (GMFCS)