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Journals / Hacettepe Üniversitesi Sağlık Bilimleri Fakültesi Dergisi / 2026 / Volume: 13 Issue: 1

Evaluation of real-ear to coupler difference (RECD) Values and Test-Retest Reliability in 0.4 cc and 2 cc Coupler Measurements in Young Adults

Murat Şahin(INONU UNIVERSITY, FACULTY OF HEALTH SCIENCES)0000-0002-0172-3580
Zeynep Sultan Evin(İNÖNÜ ÜNİVERSİTESİ)0000-0001-7736-6500
Zehra Güneş(İNÖNÜ ÜNİVERSİTESİ)0009-0008-1560-5439
Leyla Kiraz(İNÖNÜ ÜNİVERSİTESİ)0009-0000-9203-2285
Elifnur Tüdün(İNÖNÜ ÜNİVERSİTESİ)0009-0008-8498-7194
Samet Kılıç(TRAKYA ÜNİVERSİTESİ)0000-0002-1921-4565
Mehmet Aslan(İNÖNÜ ÜNİVERSİTESİ)0000-0002-0707-9984
Pages
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Publication Date
2026-04-30
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

Conclusion: HA-2 2 cc and 0.4 cc RECD measurements by using insert phones and foam tip are repeatable and clinically reliable methods in young adults.

📌 3 Key Takeaways

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Objective & Hypothesis:Objectives: The aim of this study was to obtain normative data and examine test-retest reliabilities in HA-2 2cc and 0.4 cc coupler RECD measurements in the young adult Turkish population.
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Key Findings & Data:Materials and Methods: In this study, 36 participants (17 females, 19 males), aged between 20 and 26 years (mean age = 21.80, SD = 1.27), with normal otoscopic findings, normal bilateral hearing, and no history of outer or middle ear surgery, were evaluated.
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Conclusion & Impact:Conclusion: HA-2 2 cc and 0.4 cc RECD measurements by using insert phones and foam tip are repeatable and clinically reliable methods in young adults.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:0.4 cc coupler · 2cc coupler · real-ear-to-coupler difference

Abstract

Objectives: The aim of this study was to obtain normative data and examine test-retest reliabilities in HA-2 2cc and 0.4 cc coupler RECD measurements in the young adult Turkish population. Materials and Methods: In this study, 36 participants (17 females, 19 males), aged between 20 and 26 years (mean age = 21.80, SD = 1.27), with normal otoscopic findings, normal bilateral hearing, and no history of outer or middle ear surgery, were evaluated. HA-2 2cc and 0.4 cc RECD measurements, as well as retest measurements, were conducted on both ears of the participants by using insert phones and foam tip. Results: A statistically significant positive correlation was observed between the HA-2 2 cc and 0.4 cc RECD test–retest measurements. For the 2 cc RECD test–retest results, reliability was found to be moderate at 125 Hz and 10 kHz, excellent at 3 kHz, and good at the other frequencies. For the 0.4 cc RECD test–retest results, reliability was moderate at 1 kHz, 1.5 kHz, 2 kHz, and 10 kHz, and good at the other frequencies. No interaural differences were found in the RECD values obtained with either coupler. A significant difference between male and female participants was observed only at 250 Hz for the 2 cc RECD test results, and at 125 Hz and 250 Hz for the 0.4 cc RECD test results. Across all frequencies, the 2 cc RECD values were higher than the 0.4 cc RECD values. Conclusion: HA-2 2 cc and 0.4 cc RECD measurements by using insert phones and foam tip are repeatable and clinically reliable methods in young adults.

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Cite This Article

Şahin, M., Evin, Z. S., Güneş, Z., Kiraz, L., Tüdün, E., Kılıç, S., Aslan, M. (2026). Evaluation of real-ear to coupler difference (RECD) Values and Test-Retest Reliability in 0.4 cc and 2 cc Coupler Measurements in Young Adults. Hacettepe Üniversitesi Sağlık Bilimleri Fakültesi Dergisi, Volume: 13 Issue: 1. https://doi.org/10.21020/husbfd.1783593

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