An Evidence-Based Systematic Review of Frequency Lowering in Hearing Aids for School-Age Children With Hearing Loss Purpose We developed 1 clinical question for this review, which addressed the comparison of hearing aids using frequency lowering compared to conventional processing amplification for outcomes of audibility, speech recognition, speech and language, and self- or parent-report for children with hearing loss. Method We systematically searched 26 databases ... Review Article
Review Article  |   December 01, 2012
An Evidence-Based Systematic Review of Frequency Lowering in Hearing Aids for School-Age Children With Hearing Loss
 
Author Affiliations & Notes
  • Ryan W. McCreery
    Boys Town National Research Hospital, Omaha, NE
  • Rebecca A. Venediktov
    American Speech-Language-Hearing Association, Rockville, MD
  • Jaumeiko J. Coleman
    American Speech-Language-Hearing Association, Rockville, MD
  • Hillary M. Leech
    American Speech-Language-Hearing Association, Rockville, MD
  • This systematic review was conducted under the auspices of the American Speech-Language-Hearing Association; however, this is not an official position statement of the Association.
    This systematic review was conducted under the auspices of the American Speech-Language-Hearing Association; however, this is not an official position statement of the Association.×
  • Correspondence to Ryan W. McCreery: Ryan.McCreery@boystown.org
  • Hillary M. Leech is now at Carroll County Public Schools, Maryland.
    Hillary M. Leech is now at Carroll County Public Schools, Maryland.×
  • Editor and Associate Editor: Larry Humes
    Editor and Associate Editor: Larry Humes×
Article Information
Hearing & Speech Perception / Hearing Disorders / Hearing Aids, Cochlear Implants & Assistive Technology / Research Issues, Methods & Evidence-Based Practice / Review Articles
Review Article   |   December 01, 2012
An Evidence-Based Systematic Review of Frequency Lowering in Hearing Aids for School-Age Children With Hearing Loss
American Journal of Audiology, December 2012, Vol. 21, 313-328. doi:10.1044/1059-0889(2012/12-0015)
History: Received March 13, 2012 , Revised July 2, 2012 , Accepted July 8, 2012
 
American Journal of Audiology, December 2012, Vol. 21, 313-328. doi:10.1044/1059-0889(2012/12-0015)
History: Received March 13, 2012; Revised July 2, 2012; Accepted July 8, 2012
Web of Science® Times Cited: 11

Purpose We developed 1 clinical question for this review, which addressed the comparison of hearing aids using frequency lowering compared to conventional processing amplification for outcomes of audibility, speech recognition, speech and language, and self- or parent-report for children with hearing loss.

Method We systematically searched 26 databases for studies addressing a clinical question and meeting all inclusion criteria. We evaluated studies for methodological quality and reported or calculated effect sizes when possible.

Results The literature search resulted in the inclusion of 5 studies. We implemented several different frequency-lowering strategies across studies; 2 studies used nonlinear frequency compression, 2 used frequency transposition, and 1 used frequency compression with dynamic consonant boost.

Conclusions Whereas methodological limitations of the included studies preclude the formulation of strong conclusions, findings were generally positive across frequency-lowering strategies and outcomes. Additional high-quality research is needed in this area.

Acknowledgments
This evidence-based systematic review was supported by ASHA’s National Center for Evidence-Based Practice in Communication Disorders (N-CEP). We thank Laura Cannon for updating the literature search and the following individuals for comments on an earlier version of this article: Patricia Stelmachowicz, Brenda Hoover, Ruth Bentler, Tracy Schooling, Tobi Frymark, and Rob Mullen. No author had any paid consultancy or any other conflict of interest with this document, and each author agreed to declare no competing interests.
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