High frequency thresholds: variations with age and industrial noise exposure.
The effects of age and noise exposure were investigated. 97 normal subjects representing 6 age groups were tested with both conventional pure tone audiometry and high frequency audiometry (10-20 kHz) using a commercial high frequency audiometer. Thresholds were obtained by means of earphones as opposed to a quasi-free field technique. The results were discussed in terms of the age effect. In addition, conventional and high frequency thresholds were obtained for 64 subjects who had a history of industrial noise exposure representing 4 age groups. Significant differences were found between the noise exposed group and the normal subjects. The implications of the results are discussed.
Morton
L P
LP
Department of Logopaedics, University of Cape Town.
Reynolds
L
L
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001299:Audiometry / Q000379:methods; D001309:Auditory Threshold / Q000502:physiology*; D002648:Child; D006316:Hearing Loss, High-Frequency / Q000175:diagnosis / Q000209:etiology; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D008875:Middle Aged; D009623:Noise, Occupational / Q000009:adverse effects*; D012016:Reference Values