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Experiment I showed that the DPOAE levels in the tinnitus patients were lower than those in the normal-hearing (nontinnitus) subjects. The differences depended on the frequency and the age of the patients, suggesting the confounding influence of presbyacusis. The second group of tinnitus patients with increasing and notch-like hearing loss participated in experiment II. They were also divided into two age groups, below 50 and above 50 years. The data from experiment II showed that DPOAE activity well reflects the increasing and notch-like hearing loss functions up to about 40 dB HL. The effect of age on the DPOAE level was clearly noted only for the tinnitus patients with clinically normal-hearing thresholds and was ambiguous for the tinnitus patients with hearing loss.<\/jats:p>","DOI":"10.1121\/1.2141297","type":"journal-article","created":{"date-parts":[[2006,1,5]],"date-time":"2006-01-05T17:00:48Z","timestamp":1136480448000},"page":"527-538","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":31,"title":["Distortion product otoacoustic emission (DPOAE) in tinnitus patients"],"prefix":"10.1121","volume":"119","author":[{"given":"E.","family":"Ozimek","sequence":"first","affiliation":[{"name":"A. Mickiewicz University Institute of Acoustics, , Pozna\u0144, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A.","family":"Wicher","sequence":"additional","affiliation":[{"name":"A. 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