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The audiometric threshold: measured in-situ, automated, and by the hearing aid

AHS June 2010 Lake Como. The audiometric threshold: measured in-situ, automated, and by the hearing aid. Gitte Keidser, Harvey Dillon, Anna O’Brien, Dan Zhou, Lyndal Carter, Ingrid Yeend, and Lisa Hartley National Acoustic Laboratories. Background. Conventional audiometry

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The audiometric threshold: measured in-situ, automated, and by the hearing aid

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  1. AHS June 2010 Lake Como The audiometric threshold: measured in-situ, automated, and by the hearing aid Gitte Keidser, Harvey Dillon, Anna O’Brien, Dan Zhou, Lyndal Carter, Ingrid Yeend, and Lisa Hartley National Acoustic Laboratories

  2. Background • Conventional audiometry • Most modern hearing aids have on-board generators that produce pure tones in-situ audiometry • Low-cost tests of hearing over the telephone or internet in demand  automated audiometry

  3. Self-fitting hearing aid (concept) Real-ear to coupler difference Plus trainability Adjust Hearing Aid Prescription Formula  meet high demands in developing countries where services are scarce Audiometer Automatic

  4. Questions • Is in-situ audiometry valid and reliable? • What is the effect of using different couplings (open vs closed domes) on in-situ threshold measurements? • Is automated audiometry valid and reliable?

  5. In-situ audiometry • 24 participants with known sensorineural hearing loss • Measurements (twice) • Conventional audiometry (insert) • Manual in-situ audiometry (open and closed instant tips) • REDD (insert, open, closed)

  6. Thresholds in dB HL (Test-retest, p = 0.69)

  7. REDD values (Test-retest, p = 0.58) p < 0.0000001

  8. Thresholds in dB SPL dB SPL = dB HL + REDD

  9. Reliability

  10. Reliability Supra-aural Valente et al Hawkins et al

  11. Reliability Supra-aural Valente et al Hawkins et al Insert Saunders & Morgan Valente et al Hawkins et al

  12. Automated audiometry • 23 participants (46 ears) • Threshold measurements at 0.25, 1, and 4 kHz • Manually • Automated, adaptive procedure

  13. Validity

  14. Reliability Manual audiometry (5 dB Hughson-Westlake) Automatic audiometry (2 dB final step size) Automated audiometry is at least as accurate as manual audiometry

  15. Conclusions   Most likely • Is in-situ audiometry valid and reliable? • corrections for coupling required (REDD) • ambient noise is controlled • open tips more reliable than closed tips • Is automated audiometry valid and reliable? • Is automated in-situ audiometry valid and reliable?

  16. Acknowledgement • The in-situ audiometry study was partly sponsored by Siemens Instruments • The automated audiometry study was partly sponsored by Australian Hearing • The self-fitting hearing aid concept is now being further explored through the Hearing CRC

  17. Thank you for listening! For further information:www.nal.gov.au www.hearingcrc.org Gitte.keidser@nal.gov.au

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