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EBP Compendium: Summary of Systematic Review

Fitting Hearing Aids to Adults Using Prescriptive Methods: An Evidence-Based Review of Effectiveness

Gustav Mueller, H. (2005).
Journal of the American Academy of Audiology, 16(7), 448-460.

Indicators of Review Quality:

The review addresses a clearly focused question Yes
Criteria for inclusion of studies are provided Yes
Search strategy is described in sufficient detail for replication Yes
Included studies are assessed for study quality Yes
Quality assessments are reproducible No

Description: This is a review of randomized control, randomized crossover, quasi-experimental or descriptive research investigating the use of prescriptive methods for fitting hearing aids.

Question(s) Addressed:

Is there evidence supporting the use of a commonly used method (such as NAL-NL1) versus no prescriptive method?

Population: Adults with mild to moderate hearing loss

Intervention/Assessment: Manufacturer-specific proprietary formula for fitting

Number of Studies Included: 11

Years Included: 1985 - 2005



  • Management
    • Hearing
      • Hearing Aid Fitting Prescription - NAL - “In summary, based on the use-gain data and real-world subject preferences, there is evidence to support the conclusion that for average inputs, gain approximating that recommended by the NAL-RP procedure is most preferred by adult hearing aid wearers. Because of the limited number of studies and the low statistical power of these studies, it is not possible to make a strong recommendation” (p. 459).

Keywords: Hearing Aids

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Added to Compendium: January 2012

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