Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.
An audiometric threshold notch is present when one or more of the thresholds at 3, 4, or 6 kHz exceeds the pure-tone average of the 0.5 and1 kHz thresholds by 15 dB or more, and the 8 kHz threshold is at least 5 dB lower (better) than the highest threshold in the 3 to 6 kHz range. Bilateral (present in both ears) notches are used to signify probable noise-induced hearing loss (NIHL).
Children and adolescents with extremely high thresholds, 70 dB or greater, are excluded from the numerator, because the majority of such cases are not attributable to loud noise exposure.
This hyperlink will direct you to a non-governmental Website or application.
The appearance of external hyperlinks does not constitute endorsement by the United
States Department of Health & Human Services (HHS) of the hyperlinked Website
or application, or the information, products or services contained therein. Such
hyperlinks are provided consistent with the intended purpose of this HHS Website.
Visitors to the hyperlinked Website or application will be subject to the Website
or application's privacy policies. These practices may be different than those of
this HHS Website.
You will be redirected to: link