NOTE: Because the definition of disability for children is separate from the definition
for adults, any combination of outcomes is possible; i.e., disabled prior to age 18
but not upon attainment of age 18, not disabled prior to age 18 but disabled upon
attainment of age 18, disabled both before and after attaining age 18, and not disabled.
However, because the childhood standard is a listing-level standard, it would be unusual
for an individual to be found disabled as a child but not as an adult (unless the
effects of the impairment(s) changed prior to attainment of age 18).