Other Characteristics of the Reference Population
Following Kessler and Dawson (1999), calculate a very low birth weight infant's gestation-adjusted age as follows:
Determine the infant's gestational age in weeks. [Ultrasonographic examination provides a more accurate measure of gestational age than post-natal assessments (Alexander et al., 1992).]
Subtract the child's gestational age in weeks from 40 weeks (gestational age of term infant) to determine the adjustment for prematurity in weeks.
Subtract the adjustment for prematurity in weeks from the child's post-natal
age in weeks to determine the child's gestation-adjusted age.