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) if there is also a response indicating exposure to loud sounds or noise occupationally or in leisure activities.
This Indicator uses Age-Adjustment Groups:
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