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Validity and reliability of integrated pressure level real-ear-to-coupler difference measurements
Matthew Urichuk1,2, David Purcell1,2,3, Susan Scollie1,2,3
1School of Communication Sciences and Disorders, Western University, London, Ontario, Canada.
International Journal of Audiology
|May 2, 2023
Summary
The integrated pressure level (IPL) method for measuring foam-tip real-ear-to-coupler differences (wRECD) offers improved accuracy and reliability, especially at high frequencies, compared to sound pressure level (SPL) based measurements.
Area of Science:
- Audiology
- Acoustics
- Hearing Aid Technology
Background:
- Real-ear-to-coupler differences (wRECD) are crucial for hearing aid fitting.
- Current sound pressure level (SPL)-based wRECD measurements can be affected by standing wave interference.
- An integrated pressure level (IPL) method has been proposed to potentially overcome these limitations.
Purpose of the Study:
- To validate the integrated pressure level (IPL) method for measuring foam-tip real-ear-to-coupler differences (wRECD).
- To compare the reliability of the IPL wRECD measurement to the traditional SPL-based wRECD measurement.
Main Methods:
- Bilateral SPL-based and IPL wRECD measurements were performed on 22 adults with normal hearing.
- Test-retest reliability of the IPL wRECD was assessed after full re-insertion into the ear canal.
- IPL wRECD reliability was compared to published SPL wRECD test-retest data.
Main Results:
- IPL wRECD measurements showed differences within 1.51 dB below 5000 Hz compared to SPL wRECD.
- Above 5000 Hz, IPL wRECD exceeded SPL wRECD by an average of 6.11 dB.
- The average test-retest difference for IPL wRECD was 0.75 dB, with improved reliability below 750 Hz and above 3000 Hz.
Conclusions:
- The IPL wRECD method provides improved high-frequency estimates, reducing standing wave interference.
- IPL wRECD measurements are more reliable than SPL-based measurements.
- The IPL method offers a wider valid wRECD bandwidth and does not require precise probe-microphone placement.
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