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

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.