Low dose (n=3)	Standard dose (n=6)	Total (n=9)
Male, n (%)	1 (33)	5 (83)	6 (67)
Race, n (%)
White	2 (67)	3 (50)	5 (56)
Black	0 (0)	1 (17)	1 (11)
Hispanic	1 (33)	1 (17)	2 (22)
Asian	0 (0)	1 (17)	1 (11)
Gestational weeks, median (range)	39 (36–41)	39 (38–42)	39 (36–42)
Prenatal risk factorsa
NSAID exposure	1 (33)	0 (0)	1 (11)
Caesarean delivery, n(%)	2 (67)	6 (100)	8 (89)
Birthweight (kg), median (range)	3.48 (3.15–3.96)	3.47 (2.80–3.97)	3.40 (2.80–3.97)
Age at enrollment (d), median (range)	6 (1–8)	2 (1–9)	2 (1–9)
Associated diagnoses, n (%)b
RDS	3 (100)	3 (50)	6 (67)
Meconium aspiration	2 (67)	3 (50)	5 (56)
Sepsis	1 (33)	1 (17)	2 (22)
Asphyxia	1 (33)	0 (0)	1 (11)
Penumonia	0 (0)	1 (17)	1 (11)
Oxygenation index, median (range)	39.6 (8.3–83.5)	12.4 (7.4–37.5)	15.4 (7.4–83.5)