A cross-over, double-blind comparison of the NAL-NL1 and the DSL v4.1 prescriptions for children with mild to moderately severe hearing loss

T. Y. C. Ching, Susan D. Scollie, Harvey Dillon, Richard Seewald

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The relative effectiveness of the NAL-NL1 and the DSL4.1 prescriptions for 48 children with mild to moderately severe hearing loss was studied using a double-blind, four-period, two-treatment cross-over design in Australia and in Canada. Evaluations included speech perception tests, loudness ratings, reports from parents and teachers on functional performance in real life, children's self-reports, paired-comparison judgements of intelligibility, and children's preferences in real-world environments. Electroacoustic measures of hearing aids revealed that gain differences dominated the comparison. Across trials and measures, individual Australian children consistently preferred either the NAL-NL1 or the DSL v.4.1 prescription. An overall figure of merit (FOM), calculated by averaging the standardized difference scores between prescriptions for all measures, revealed that the strongest prescription-related differences were found in Australia. On average, an advantage and preference for the NAL-NL1 prescription was associated with lesser degrees of hearing loss. This research provides evidence on the effectiveness of the NAL-NL1 and DSL v.4.1 prescriptions, and highlights the need for evaluating and fine-tuning amplification to meet the diverse needs of individual children in real life.

Original languageEnglish
Pages (from-to)S4-S15
Number of pages12
JournalInternational Journal of Audiology
Volume49
Issue numberSuppl. 1
DOIs
Publication statusPublished - 2010
Externally publishedYes

Keywords

  • hearing aid prescription
  • children
  • NAL-NL1
  • DSL v.4.1
  • cross-over comparison
  • double-blind study
  • amplification

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