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CC BY-NC-ND 4.0 · Annals of Otology and Neurotology 2020; 3(02): 077-081
DOI: 10.1055/s-0041-1724218
Original Article

Comparative Study on Method of Threshold Estimation: Distortion Product Threshold Test versus Pure Tone Threshold Test

Gunjan Mehta
1   Department of Audiology and Speech Therapy, C.U. Shah Medical College and Hospital, Surendranagar, Gujarat, India
,
Anuj Kumar Neupane
2   School of Audiology and Speech Language Pathology, Bharati Vidyapeeth Deemed University, Pune, India
,
Abhishek Mistri
1   Department of Audiology and Speech Therapy, C.U. Shah Medical College and Hospital, Surendranagar, Gujarat, India
,
Hiral Joshi
1   Department of Audiology and Speech Therapy, C.U. Shah Medical College and Hospital, Surendranagar, Gujarat, India
,
Nirmit Shah
1   Department of Audiology and Speech Therapy, C.U. Shah Medical College and Hospital, Surendranagar, Gujarat, India
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Abstract

Introduction Distortion product otoacoustic emissions (DPOAEs) can be helpful in estimating the hearing thresholds by extrapolating the DPOAE input/output function with the help of scissor paradigm, and thus the following study aims at assessing its reliability by comparing DPOAE thresholds with those obtained by behavioral responses at pure tones on various frequencies.

Materials and Methods Fifty participants having normal hearing sensitivity were included in the study. Pure tone (PT) audiometry was carried out on all participants to determine PT thresholds in both ears. DPOAE threshold test was administered and thresholds at 1, 2, 4, and 8 kHz were compared accordingly.

Results The result indicated significant difference between the two methods of threshold estimation where the mean difference was found to be 3 decibel (dB) and 4 dB for left and right ears, respectively. Shapiro-Wilk test revealed normal distribution (p > 0.05) of the data. Hence, parametric paired t-test was performed, which revealed significant difference between PT and distortion product thresholds.

Conclusion Study concludes as having good clinical applicability in assessing neonates and infants.

Keywords

DPOAE - pure tone - thresholds - input/output functions


Publication History

Article published online:
04 March 2021

© 2021. Indian Society of Otology. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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