| 000 | 02010nam a22001817a 4500 | ||
|---|---|---|---|
| 003 | OSt | ||
| 005 | 20150529122406.0 | ||
| 008 | 150529b xxu||||| |||| 00| 0 eng d | ||
| 040 | _cNational Acoustic Laboratories | ||
| 100 | _aWilson, Richard H. | ||
| 245 | _aCharacteristics of the audiometric 4,000 Hz notch (744,553 veterans) and the 3,000, 4,000, and 6,000 Hz notches (539,932 veterans) | ||
| 520 | 3 | _aThe purpose of this study was to examine the prevalence and characteristics of audiograms that are notched (1) at 4,000 Hz and (2) at 3,000, 4,000, and/or 6,000 Hz. Bilateral audiograms from 1,000,001 veterans were obtained from Department of Veterans Affairs archives; after “cleaning” algorithms were applied, 744,553 participants (mean age = 63.5 yr) were included in the 4,000 Hz notch analysis (group 1) and 539,932 participants (mean age = 62.2 yr) were included in the 3,000, 4,000, and/or 6,000 Hz notch analysis (group 2). A notch was defined when the threshold at the notch frequency (3,000, 4,000, or 6,000 Hz) minus the 2,000 Hz threshold and the threshold at the notch frequency minus the 8,000 Hz threshold both were greater than or equal to10 dB. In group 1, 77.1% did not have a notch at 4,000 Hz. In group 2, 65.3% did not have a notch at 3,000, 4,000, or 6,000 Hz; 12.4% had bilateral notches, 11.7% had left ear notches, and 10.7% had right ear notches. The notches were about twice as deep on the low-frequency side of the notch than on the high-frequency side. The mean left ear and right ear notch depths were about the same (23 dB), with mode notch depths in the 15.0 to 17.5 dB range. | |
| 650 | _aaudiogram, bilateral, hearing loss, high-frequency, multisite, noise exposure, noise notch, notched audiogram, unilateral, veterans. | ||
| 700 | _a Rachel McArdle, | ||
| 773 | 0 |
_g Volume 50, Number 1, 2013 Pages 111–132 _tJRRD |
|
| 856 | _uhttp://dspace.nal.gov.au/xmlui/bitstream/handle/123456789/174/Characteristics.pdf?sequence=1&isAllowed=y | ||
| 942 |
_2udc _cARTICLE |
||
| 999 |
_c2435 _d2435 |
||