A study of the Responses of Hearingfor Normal Hearing of Iraqi and Sudanese UsingDistortion product Otoacoustic Emissions.

Abstract

The purpose of this research was designed to study theresponsesof hearing or distortion product otooacoustic emissions amplitude(DPI) for normal hearing of Iraqi and Sudanese using Distortion product Otoacoustic Emissions and to study the influence of the age, ear side, gender and racial on theresponsesof hearing for normal hearing of Iraqi and Sudanese subjects and comparison between them. An additional purpose of this study was proposal model Linear and nonlinear Equations to evaluate the average of DPI with Respect of Frequency For all groups Iraqi and Sudanese .Final goal of the present study was the Comparison of The Average of DPI Level with respect to frequency between The Experimental data and Theoretical model data for Iraqi and Sudanese Groups. Routine procedures were used such as pure tone Audiometer was performed to assess hearing ability in all subjects and tympanometry was performed to assess middle ear system. The total number of Iraqi subjects which completed all tests was 106 male and female with age from (2-40) y were divided into four groups based on age : Group-I (2-10) year , with total number of subjects is 26 consisted of 13 females and 13 males , Group-II (11-20) year, with total number of subjects is 26 consisted of 13 females and 13 males, Group-III (21-30) year ,with total number of subjects is 28 consisted of 13 females and 15 males, Group-IV(31-40) year, with the total number of subjects is 26 consisted of 13 females and 13 males.For Sudanese subjects the total number of subjects which completed all tests was 78 Subjects with age from (2-30) year contained (39) females and (39) males. Subjects were placed into three groups based on age Group-I (2-10) year, with total number of subjects is 26 consisted of 13 females and 13 males, Group-II (11-20) year, with total number of subjects is 26 consisted of 13 females and 13 males, Group-III (21-30) year, with total number of subjects is 26 consisted of 13 females and 13 males. The experimental data was revealed that: The decision about whether a Distortion Product Otoacoustic Emission is present often depends on a visual assessment of the response along with certain objective criteria, such as distortion product otoacoustic emissions level (DP1) and signal to Noise Ratio dB. DPOAEs were considered present when the signal level exceeded the noise floor by 3 dB SPL for narrow frequency bands and 6 dB SPL for wide frequency bands and DPOAEs is thought to have an amplitude( DPI level) that may vary from -10dB SPL to +30dB SPL in healthy ears. The results show an age, ear asymmetry, gender and racial were effect on the (DP1 level and SNRs) for all Iraqi and Sudanese subjects.Statistically Results show significant difference among age groups on (DPI and SNRs) but according to ear side, gender and racial No significant difference on the (DP1 and SNRs). The Comparison of The Average of DPI Level with respect to frequency between The Experimental tested data and Theoretical model data was approximately similar for Iraqi and Sudanese Subjects respectively. The result show the nonlinear proposal model was better than that from linear model to evaluate the average of DPI compared with experimental tested