Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Mean DPOAE level as a function of age for 20 infants comprising group 3: postnatal longitudinal database. Infants were tested initially at birth (or equivalence) then repeatedly at 3, 4, 5, and 6 mos. The f2 frequency is the parameter; (b) mean DP-gram (DPOAE level × f2) for the same 20 infants with age as the parameter. See Table 3 for SDs of the mean.
