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10/13/2017  |   10:30 AM - 11:30 AM   |  East Ballroom at Shalala Student Services Building

Comparison of Distortion-Product Otoacoustic Emissions between Cambodian and United States Children

Distortion-product otoacoustic emissions (DPOAEs) test often used as a hearing screening tool for children because it is quick and does not require patient response. People with DPOAE-to-noise ratio of 6 dB or higher at a frequency usually have hearing thresholds within normal limits or thresholds less than 40 dB HL at the test frequency. Yet little is known about the DPOAE amplitudes of children in developing countries. The purpose of this study was to compare the DPOAE amplitudes between Cambodian and United States (US) children from ages 5 to 16 years. School-aged children from the two countries were divided into 6 age groups and they were tested using the EroScan Pro at 1500, 2000, 3000, 4000, 5000, and 6000 Hz. The DPOAEs of children with unremarkable otoscopy and Type A tympanograms were included in the data analysis (N=368 ears from the US; N=783 ears from Cambodia). US children were also tested with pure tone audiometry to ensure their hearing thresholds were within 20 dB HL from 500 to 8000 Hz. Results showed that US children, in general, had significantly higher DPOAEs amplitudes than Cambodian children (p<0.05). For both US and Cambodian children, DPOAEs amplitudes were higher at low than high frequencies (p<0.05) and for younger than older children (p<0.05). Amplitudes were also higher for the right ears than left ears among Cambodian children. The lower DPOAE amplitudes among Cambodian children could be attributed to either racial differences or higher prevalence of ear and hearing disorders and inaccessibility of healthcare among the Cambodia children because DPOAE amplitudes are often reduced among children with a history of otitis media. Additionally, the differences among age and test frequencies could be caused by an increase in noise exposure in the apical end of the cochlea duct or increased noise exposure with age.

• 1. Visualize and describe the DPOAE differences between Cambodian and US children in different age range
• 2. Visualize and describe the relative DPOAE amplitudes of Cambodian and US children across low to high frequencies
• 3. Apply the knowledge in future hearing tests and in identifying children with hearing loss

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King Chung (POC,Primary Presenter), Northern Illinois University, amplificationrocks@yahoo.com;
Dr. King Chung is a Professor of Audiology at Northern Illinois University. She has been leading students on humanitarian research and service trips to different countries every summer for several years. The long-term goal for these research and service trips is to facilitate better hearing services to all peoples around the world. A researcher at heart, Dr. Chung report the hearing systems in the visited countries/regions and the hearing status of people tested during these trips in professional publications so that more people are aware of the great demands for hearing services in different countries. The long-term goals of these humanitarian research and service trips are: 1. To facilitate academic and clinic exchanges, 2. To deliver hearing services to underprivileged populations, 3. To provide participants wit opportunities for cultural immersion 4. To advocate better hearing services for underserved and unserved populations around the the world

ASHA DISCLOSURE: Financial - Receives Other financial benefit for Other activities from Program Director of a trip partially sponsored by Oticon US..   Nonfinancial - No relevant nonfinancial relationship exists.

AAA DISCLOSURE: Financial - Receives support from Oticon US .

Kaitlin Anderson (Author,Co-Author), NIU, niu.oaes.usa@gmail.com;
Kaitlin is a 4th-year Au.D. student at Northern Illinois University, currently completing her externship rotation at the University of Illinois Hospital and Health Sciences System in Chicago.

ASHA DISCLOSURE: Financial - Nonfinancial -

AAA DISCLOSURE: Financial - No relevant financial relationship exists.

Kara Combs (Author,Co-Author), Z1743536@students.niu.edu;
Kara is a 4th-year Au.D. student at Northern Illinois University, currently completing her externship rotation at Nationwide Children's Hospital in Columbus, Ohio.

ASHA DISCLOSURE: Financial - Nonfinancial -

AAA DISCLOSURE: Financial - No relevant financial relationship exists.

Mariah Cheyney (Co-Author), Northern Illinois University, mcheyney@niu.edu;
Dr. Mariah Cheyney is an Assistant Clinical Professor at Northern Illinois University. She received a clinical doctorate in audiology from The University of Pittsburgh and was a recipient of the United States Office of Special Education Programs (OSEP) Grant for pediatric audiology. Dr. Cheyney has clinical externship and work experience at Children’s Hospital of Pittsburgh, Cincinnati Children’s Hospital Medical Center, and Children’s Healthcare of Atlanta. Within pediatric audiology, her specialties include electrophysiology testing in infants, pediatric balance assessments, and implantable devices including bone anchored hearing devices and cochlear implants. Her research interests currently include investigation of the utility of wideband reflectance and wideband tympanometry in infant assessment, and dichotic listening testing protocols in auditory processing assessments.

ASHA DISCLOSURE: Financial - Nonfinancial -

AAA DISCLOSURE: Financial - No relevant financial relationship exists.