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Comparison of SSPL90 selection procedures.

D B Hawkins1, T L Ball, H E Beasley

  • 1Department of Speech-Language Pathology & Audiology, University of South Carolina, Columbia 29208.

Journal of the American Academy of Audiology
|January 1, 1992
PubMed
Summary
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Different methods for determining the maximum output setting (SSPL90) for hearing aids yield varied results for individuals with mild-to-moderate hearing loss. These differences were statistically significant at certain frequencies, impacting hearing aid fitting.

Area of Science:

  • Audiology
  • Hearing Science
  • Speech and Hearing Sciences

Background:

  • The selection of appropriate hearing aid amplification is crucial for individuals with sensorineural hearing loss.
  • Accurate determination of the Sound Pressure Level 90 (SSPL90), the maximum output level, is essential for comfortable and effective hearing aid use.
  • Various procedures exist to determine SSPL90, but their consistency across different hearing loss profiles is not fully understood.

Purpose of the Study:

  • To compare the recommended SSPL90 values obtained using six different selection procedures for individuals with mild-to-moderate sensorineural hearing loss.
  • To identify statistically significant differences among these procedures at specific frequencies (500, 1000, and 2000 Hz).

Main Methods:

  • Six distinct procedures were employed to determine SSPL90 values.

Related Experiment Videos

  • These included threshold-based methods (Cox, Seewald & Ross) and loudness discomfort procedures (Berger, McCandless & Lyregaard, Hawkins et al, Libby).
  • The study involved 16 subjects diagnosed with mild-to-moderate sensorineural hearing loss.

    • Main Results:

    • Statistically significant differences in recommended SSPL90 values were observed among the tested procedures, particularly at 500 Hz and 2000 Hz.
    • Individual subject data revealed variability, with some participants yielding similar SSPL90s across methods, while others showed considerable discrepancies.
    • The Upper Limit of Comfortable Listening (ULCL) and threshold-based procedures showed varying degrees of agreement.

    Conclusions:

    • The choice of SSPL90 selection procedure can significantly influence hearing aid fitting outcomes for individuals with mild-to-moderate sensorineural hearing loss.
    • Audiologists should be aware of the potential variability in SSPL90 values generated by different methods.
    • Further research may be warranted to refine SSPL90 determination protocols for optimal patient benefit.