Table 1.

Basic demographic and clinical data

Demographic	Median (interquartile range) or number (%)
GA at birth (wk)	28.9 (27.5–30)
Cesarean-section delivery	55 (56%)
Age at birth scan (d)	10 (7–13)
Postmenstrual age at birth scan (wk)	30.1 (29.1–31.6)
Postmenstrual age at term scan (wk)	42.1 (40.2–43.1)
Weight at birth (kg)	1.12 (0.96–1.39)
Apgar score at 1 min	6 (4–8)
Apgar score at 5 min	8 (6–9)
CRIB II	7 (5–9)
Mechanical ventilation (d)	5 (2–15)
Resuscitation required (CPR)	11 (11%)
Respiratory distress syndrome	93 (96%)
Chronic lung disease	18 (18%)
Patent ductus arteriosis	26 (27%)
Sepsis (cultures positive)	33 (34%)
Meningitis (cultures positive)	2 (4%)
Necrotizing enterocolitis	11 (12%)

CPR, cardiopulmonary resuscitation; CRIBII, Clinical Risk Index for Babies II; GA, gestational age.