Developing distortion product otoacoustic emissions normative data for the otometric madsen capella

Abstract EN

Objectives: To develop and establish a distortion product otoacoustic emissions normative data (DPOAEs ) for normal hearing adults.

Methods: The right ear of 400 subjects of both sexes aged between 18-25 year old who are otologically normal were selected to participate in the present study which was carried out at the audiology department of King Hussein Hospital between August 2015 and December 2016.

The right ear of the 400 subjects underwent otoscopic examination, pure tone audiometry , Tympanometry and distortion product otoacoustic emission , all measurements were performed in an isolated test booth with the same audiologist.

Results: The results of the present study showed significantly greater DPOAEs levels (P<0.01) in the adult subjects between the primary tone levels L1=75 to 65 dB and L2 =65 to 55 dB.

The differences being in the vales of 6 to -3 at 500Hz, 17 to -1at l000 Hz, 7 to 2 at 2000Hz, 5 to -4 at 4000 Hz , and from 9 to -4 at 8000 Hz, the adopted normative data can be used to quantify the estimated hearing threshold levels for subject.

Conclusion: DPOAEs normative data developed for the otometrics Madsen Capella-2 can be adopted for estimation of behavioral hearing threshold levels taking into consideration to assess the noise floor and avoid any contamination of internal noise may be generated from the subjects.