a. Median, IQR, 5th and 95th percentile aHRC-24h for infants who died or had severe IVH (gray) compared to infants who survived or did not have severe IVH (white). *P< 0.01 using logistic regression to adjust for gestational age
b. Median, IQR, 5th and 95th percentile aHRC-7d for infants who had late onset septicemia (LOS), necrotizing enterocolitis (NEC), bronchopulmonary dysplasia (BPD) or severe retinopathy of prematurity (ROP) (gray) compared with those who did not have the outcome (white). *P< 0.01 using logistic regression to adjust for gestational age
c. Median, IQR, 5th and 95th percentile aHRC-24h (white) and aHRC-7d (stripes) by gestational age. The correlation coefficient of aHRC-24h and aHRC-7d with gestational age was -.3999 and -.4276, respectively.