Extended high-frequency thresholds in noise-induced hearing loss.
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.
Hallmo
P
P
Department of Otorhinolaryngology, Ullevål University Hospital, Oslo, Norway.
Borchgrevink
H M
HM
Mair
I W
IW
D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D007839:Functional Laterality; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged