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82 regular clients at a hearing-aid shop in Italy took part in the study and provided data for 119 ears in total. For each ear, middle-ear compliance was determined by tympanometry, and earmould vent size was systematically varied until the size was found that just solved the client’s occlusion-related problems with own voice. Hearing threshold levels were also measured.
The statistical analysis showed that 59% of the variation in vent size could be explained by the measured compliance values, whereas low-frequency hearing loss explained as little as 0.3%. That is, we found no relation between low-frequency hearing loss and the required vent size. This is in contrast to the common wisdom that vent size should be prescribed from the amount of hearing loss at the low frequencies.
Carle R, Laugesen S, Nielsen C (2002). Observations on the relations among occlusion effect, compliance, and vent size. Journal of the American Academy of Audiology, 13(1), p. 25-37.
This study was performed in collaboration with Roberto Carle, Audiovox, Livorno, Italy, who collected the data.
The Oticon Foundation established the Eriksholm Workshop series for gathering small groups of experts in audiology and hearing science.
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