Extended high-frequency thresholds in noise-induced hearing loss
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Published on: October 16, 2012
P Hallmo1, H M Borchgrevink, I W Mair
1Department of Otorhinolaryngology, Ullevål University Hospital, Oslo, Norway.
Abstract:
Air-conduction and bone-conduction thresholds were measured in the conventional audiometric frequency ranges, and air-conduction alone in the extended high-frequency range of 9-18 kHz in 167 males with a history of occupational noise exposure. The subjects were grouped according to age. Hearing loss in the conventional frequency range was classified in different grades. Threshold elevation in the extended high-frequency range was present in all age groups and grades of conventional frequency hearing loss. An age effect in the extended high-frequency range was present only in the lowest grades of conventional frequency noise-induced hearing loss.
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