Researchers should be careful attributing higher Bayley-III scores to changes in acute care. At-risk children who previously qualified for early developmental intervention may no longer do so. School-age longitudinal studies are needed to determine the accuracy of early developmental estimates using the Bayley-III.

The neurodevelopmental indices of children who have undergone neonatal cardiac surgery for interrupted aortic arch are below normative values; those of children with chromosomal abnormalities are even lower. For children without a chromosomal abnormality, longer deep hypothermic circulatory arrest times and low Apgar scores predict lower mental developmental indices at 18 to 24 months of age.

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