Relationship of Head Circumference and Age in the Prediction of the Real-Ear-to-Coupler Difference (RECD)Funding This research was supported by an AU-sponsored program fund (242398 GN RESOUND).
Background Pediatric hearing instrument fitting is optimally performed with individually obtained real-ear-to-coupler difference (RECD) measurements. If these measurements cannot be obtained, predicted values based on age are used. Recent evidence obtained from children aged 3–11 years suggests that head circumference (HC) may be a viable alternative or addition to age for use in RECD prediction.
Purpose The purpose of the present study was to determine if HC can be used to predict RECDs in infants, children, and adults.
Research Design A correlational design was used. HC and RECD values were measured in all participants.
Study Sample Participants were 278 North American infants and children (136 males and 142 females) aged 1.6 months to 11 years and 109 adults (42 males and 67 females) aged 18 years to 83 years.
Data Collection and Analysis After otoscopic inspection and immittance measurements were performed to assess candidacy for inclusion in the study, HC was measured twice for all participants and a single RECD measure was obtained for each participant at twelve frequencies (250 through 12500 Hz). The reliability of HC measurements was assessed with an intraclass correlation analysis. Linear regression analyses were performed with age and HC as predictor variables and RECDs as the dependent variable.
Results Analysis indicated good reliability of the HC measurement. The relationships between RECD and HC were comparable with the relationships between RECD and age. Combining HC and age did not improve predictive accuracy.
Conclusions HC can be used in children and adults as an alternative metric in the prediction of RECDs when individual RECDs cannot be obtained.
Presented as a podium presentation at the World Congress of Audiology, Vancouver, British Columbia, Canada, September 21, 2016; presented as a poster at the 7th Annual International Pediatric Audiology Conference, Atlanta, GA, October 4, 2016; and presented at the fall meeting of the West Virginia Audiology Association, Pipestem, WV, September 29–30, 2017.
02 September 2020 (online)
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- 1 American Academy of Audiology (AAA). American Academy of Audiology Clinical Practice Guidelines on Pediatric Amplification. 2013 http://www.audiology.org/publications-resources/document-library/pediatric-rehabilitation-hearing-aids . Accessed July 9, 2016
- 2 Audioscan. Verifit® User's Guide 4.2. 2015 https://docs.audioscan.com/userguides/archive/Verifit2UsersGuide4.2.pdf . Accessed August 5, 2019
- 3 Bagatto MP, Moodie S, Scollie S, Seewald R, Moodie S, Pumford J, Liu R. Clinical protocols for hearing instrument fitting in the desired sensation level method. Trends Amp 2005; 9 (04) 199-226
- 4 Bagatto MP, Scollie SD, Seewald RC, Moodie KS, Hoover BM. Real-ear-to-coupler difference predictions as a function of age for two coupling procedures. J Am Acad Audiol 2002; 13 (08) 407-415
- 5 Bagatto MP, Scollie SD, Hyde M, Seewald R. Protocol for the provision of amplification within the Ontario infant hearing program. Int J Audiol 2010; 49 (Suppl. 01) S70-S79
- 6 Bagatto MP, Seewald RC, Scollie SD, Tharpe AM. Evaluation of a probe-tube insertion technique for measuring the realear-to-coupler difference (RECD) in young infants. J Am Acad Audiol 2006; 17 (08) 573-581
- 7 Bingham K, Jenstad LM, Shahnaz N. Longitudinal changes in real-ear to coupler difference measurements in infants. J Am Acad Audiol 2009; 20 (09) 558-568
- 8 Blumsack J, Clark-Lewis S, Ross M. Comparing RECD norms to measured values in undernourished children. 2011 Poster Presentation at the 23rd Annual Meeting of the American Academy of Audiology, Chicago, IL, April 8, 2011
- 9 Blumsack JT, Clark-Lewis S, Watts KM, Wilson MW, Ross ME, Soles L, Ennis C. Alternative metrics for real-ear-to-coupler difference average values in children. J Am Acad Audiol 2014; 25 (09) 823-833
- 10 Cohen J. Statistical Power Analysis for the Behavioral Sciences. Hillsdale, NJ: Lawrence Erlbaum Associates; 1988
- 11 Centers for Disease Control and Prevention. Measuring Head Circumference. 2016 https://stacks.cdc.gov/view/cdc/38538 . Accessed April 1, 2018
- 12 de Onis M, Frongillo EA, Blossner M. Prevalence and trends of stunting among-pre-school children 1990–2020. Pub Health Nutr 2011; 15 (01) 142-148
- 13 de Onis M, Onyango AW, Van den Broeck J, Chumlea WC, Martorell RM. Measurement and standardization protocols for anthropometry used in the construction of a new international growth reference. Food Nutr Bull 2004; 25 (01) S27-S36
- 14 Feigin JA, Kopun JG, Stelmachowicz PG, Gorga MP. Probetube microphone measures of ear-canal sound pressure levels in infants and children. Ear Hear 1989; 10 (04) 254-258
- 15 Joint Committee on Infant Hearing. Year 2007 Position Statement: Principles and Guidelines for Early Hearing Detection and Intervention Programs. 2007 http://pediatrics.aappublications.org/content/120/4/898.full?ijkey5oj9BAleq21OlA&keytype5ref&siteid5aapjournals . Accessed February 2, 2018
- 16 Margolis RH, Bass-Ringdahl S, Hanks WD, Holte L, Zapala DA. Tympanometry in newborn infants–1 kHz norms. J Am Acad Audiol 2003; 14 (07) 383-392
- 17 Martin HC, Munro KJ, Langer DH. Real-ear to coupler differences in children with grommets. Br J Audiol 1997; 31 (01) 63-69
- 18 McCreery RW, Walker EA, Spratford M, Bentler R, Holte L, Roush P, Oleson J, Van Buren J, Moeller MP. Longitudinal predictors of aided speech audibility in infants and children. Ear Hear 2015; 36 (01) 24S-37S
- 19 McCreery RW, Bentler RA, Roush PA. Characteristics of hearing aid fitting in infants and young children. Ear Hear 2013; 34 (06) 701-710
- 20 Moodie S, Pietrobon J, Rall E, Lindley G, Eiten L, Gordey D, Davidson L, Moodie K, Bagatto M, Haluschak M, Folkeard P, Scollie S. Using the real-ear-to-coupler difference within the American Academy of Audiology pediatric amplification guide-line: protocols for applying and predicting earmold RECDs. J Am Acad Audiol 2016; 27 (03) 264-275
- 21 Moodie S, Rall E, Eiten L, Lindley G, Gordey D, Davidson L, Bagatto M, Scollie S. Pediatric audiology in North America: current clinical practice and how it relates to the American Academy of Audiology pediatric guideline. J Am Acad Audiol 2016; 27 (03) 166-187
- 22 Nozza RJ, Bluestone CD, Kardatzke D, Bachman R. Towards the validation of aural acoustic immittance measures for diagnosis of middle ear effusion in children. Ear Hear 1992; 13: 442-453
- 23 Nozza RJ, Bluestone CD, Kardatzke D, Bachman R. Identification of middle ear effusion by aural acoustic admittance and otoscopy. Ear Hear 1994; 15: 310-323
- 24 Roush J, Bryant K, Mundy M, Zeisel S, Roberts J. Developmental changes in static admittance and tympanometric width in infants and toddlers. J Am Acad Audiol 1995; 6 (04) 334-338
- 25 Scollie S, Seewald R, Cornelisse L, Moodie S, Bagatto M, Laurnagaray D, Beaulac S, Pumford J. The Desired Sensation Level multistage input/output algorithm. Trends Amplif 2005; 9 (04) 159-197