Distortion-product otoacoustic emissions in ears with normal hearing sensitivity: test-retest variability

Area of Science:

• Audiology
• Otoacoustic Emissions
• Hearing Science

Background:

• Distortion-product otoacoustic emissions (DPOAEs) are objective measures of cochlear function.
• Understanding DPOAE test-retest variability is crucial for accurate clinical interpretation.
• Previous research indicates variability, but specific patterns require further investigation.

Purpose of the Study:

• To quantify the test-retest variability of distortion-product otoacoustic emissions (DPOAEs) in individuals with normal hearing.
• To identify patterns of variability across different frequencies and over time.

Main Methods:

• Eight participants (4 women, 4 men) with normal hearing sensitivity were enrolled.
• Distortion-product otoacoustic emissions were measured across two sessions per day for four days over two weeks.
• Data analysis focused on calculating the range and consistency of DPOAE levels.

Main Results:

• Most test-retest variations in DPOAE levels were small, averaging approximately 2 dB.
• Significant variations (≥6 dB) were predominantly observed at higher test frequencies.
• The occurrence of extreme variations was infrequent.

Conclusions:

• Distortion-product otoacoustic emissions demonstrate good test-retest reliability in normal-hearing ears, with minor fluctuations.
• Clinically significant changes in DPOAEs should be interpreted cautiously, especially if isolated to high frequencies.
• Confirmation of substantial changes at lower frequencies is recommended before considering a finding clinically positive.