Figure 4.
Comparison of the mean annual increase in auditory thresholds (in dBHL) at the frequencies from 250 Hz to 8000 Hz between the A1 and A2 assessments, for the DMAH group and its respective control.
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.