Presbyacusis—hearing thresholds and the ISO 7029
Authors: Stenklev, Niels; Laukli, Einar
Source: International Journal of Audiology, Volume 43, Number 5, Number 5/May 2004 , pp. 295-306(12)
Publisher: Informa Healthcare
Abstract:The purpose of this study was to analyse the changes inpure-tone hearing thresholds with age. We studied a randomsample of 232 elderly subjects with a battery ofaudiological tests, including pure-tone audiometry in theconventional and extended high-frequency range, usingthe normative distributions from the InternationalOrganization for Standardization (ISO) standard 7029for comparison. Sixty otologically normal (ON) subjectswere selected for comparative analysis with theunscreened (US) sample, and for description of genderand age group differences. With the use of a mathematicaltransformation of threshold data, it was found thatthe ISO 7029 normative a coefficient in females may beset too low compared to our sample in the lower frequencies,leading to an underestimation of hearingthresholds in ON females. In our ON sample, hearingthresholds deteriorated with age in the extended highfrequencyaudiometric range. No gender threshold differenceswere found, although the prevalence of unmeasurableresponses was higher in males at some of thesefrequencies. The ON screening criteria in ISO 7029 maybe unreliable in subjects over 60 years of age, as thresholddifferences between ON and US subjects were not consistentat any frequency.
Document Type: Research Article
Affiliations: ENT Department, University Hospital of Tromsø, Tromsø, Norway
Publication date: May 1, 2004