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Practical considerations of real-ear-to-coupler difference measures in infants

A M Tharpe1, D Sladen, H M Huta

  • 1Vanderbilt Bill Wilkerson Center for Otolaryngology and Communication Sciences, Vanderbilt University Medical Center, Nashville, TN 37212, USA. tharpeam@ctrvax.vanderbilt.edu

American Journal of Audiology
|August 15, 2001
PubMed

Insights

This study found that both constant insertion depth and acoustic methods for real-ear-to-coupler difference (RECD) measurements in infants offer similar reliability, which decreases with age.

Area of Science:

  • Audiology
  • Pediatric audiology
  • Acoustics

Background:

  • Accurate audiological assessments in infants are crucial for early intervention.
  • The real-ear-to-coupler difference (RECD) is essential for calibrating hearing devices.
  • Understanding RECD measurement reliability in infants is vital for clinical practice.

Purpose of the Study:

  • To evaluate practical issues of real-ear-to-coupler difference (RECD) measurements in infants.
  • To compare the constant insertion depth method with the acoustic method for RECD measurement.
  • To assess the test-retest reliability of RECD measurements in infants up to one year of age.

Main Methods:

  • Twenty-two newborns underwent monthly RECD measurements for their first year.
  • Two RECD measurement techniques were compared: constant insertion depth and acoustic methods.
  • Test-retest reliability was analyzed for each method and for between-ear measurements.

Main Results:

  • No significant difference in reliability was found between the constant insertion depth and acoustic RECD methods.
  • Good test-retest reliability was observed in the mid-frequency range for both methods.
  • Reliability decreased at the frequency spectrum's extremes and with increasing infant age.

Conclusions:

  • Both evaluated RECD measurement methods are clinically viable for infants.
  • Audiologists should be aware of decreasing reliability with age, especially at frequency extremes.
  • Mid-frequency RECD measurements demonstrate the highest reliability in infants.

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