The test was carried out by using the EP15 Eclipse Module device and OtoAccess™ database software program (Interacoustics, Middelfart Denmark) binaurally. DPOAE test was applied at frequencies of 1000–2000–4000-6000 Hz. Signal, noise, signal to noise ratio (S/N-R) values obtained from DPOAE tests were used as study parameters. For DPOAEs two simultaneous pure-tone signals were presented to the ear at two different frequencies (f1 and f2, where f2 > f1). Recordings were obtained with a frequency ratio f2/f1 fixed at 1.22.

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