J Am Acad Audiol 2001; 12(10): 506-513
DOI: 10.1055/s-0042-1745641
Original Article

Distortion-Product Otoacoustic Emissions in Schoolchildren: Effects of Ear Asymmetry, Handedness, and Gender

Tegan Keogh
Department of Speech Pathology and Audiology, The University of Queensland, St. Lucia, Queensland, Australia
Joseph Kei
Department of Speech Pathology and Audiology, The University of Queensland, St. Lucia, Queensland, Australia
Carlie Driscoll
Department of Speech Pathology and Audiology, The University of Queensland, St. Lucia, Queensland, Australia
Veronica Smyth
Department of Speech Pathology and Audiology, The University of Queensland, St. Lucia, Queensland, Australia
› Author Affiliations


The present study examined effects of ear asymmetry, handedness, and gender on distortionproduct otoacoustic emissions (DPOAEs) obtained from schoolchildren. A total of 1003 children (528 boys and 475 girls), with a mean age of 6.2 years (SD = 0.4, range = 5.2–7.9 years), were tested in a quiet room at their schools using the GSI-60 DPOAE system. A distortion-product (DP)-gram was obtained for each ear, with f2 varying from 1.1 to 6.0 kHz and the ratio of f2/f 1 at 1.21. The signal-to-noise ratios (SNRs) (DPOAE amplitude minus the mean noise floor) at the tested frequencies 1.1,1.5, 1.9, 2.4, 3.0, 3.8, 4.8, and 6.0 kHz were measured. The results revealed a small but significant difference in SNR between ears, with right ears showing a higher mean SNR than left ears at 1.9, 3.0, 3.8, and 6.0 kHz. At these frequencies, the difference in mean SNR between ears was less than 1 dB. A significant gender effect was also found. Girls exhibited a higher SNR than boys at 3.8, 4.8, and 6.0 kHz. The difference in mean SNR, as a result of the gender effect, was about 1 to 2 dB at these frequencies. There was no significant difference in mean SNR between left-handed and right-handed children for all tested frequencies.

Abbreviations: DPOAE = distortion-product otoacoustic emission, OAE = otoacoustic emission, SNR = signal-to-noise ratio, SOAE = spontaneous otoacoustic emission, TEOAE = transient evoked otoacoustic emission

Publication History

Article published online:
07 March 2022

© 2001. American Academy of Audiology. This article is published by Thieme.

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