[ Christopher McCreery. (Jul. 21, 2008). [KNIGHTS OF MALTA ...
Ryan W. McCreery, Ph.D. Boys Town National Research Hospital … · 2021. 2. 9. · McCreery,...
Transcript of Ryan W. McCreery, Ph.D. Boys Town National Research Hospital … · 2021. 2. 9. · McCreery,...
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Ryan W. McCreery, Ph.D. Boys Town National Research Hospital [email protected]
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Elizabeth Walker, Ph.D. University of Iowa
Meredith Spratford, Au.D. BTNRH
Jacob Oleson, Ph.D. University of Iowa
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Child factors Degree of hearing loss
Ear canal growth
Hearing aid fitting External factors
Distance
Noise
Reverberation
Context
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Audibility Hearing aid use
Auditory exposure
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Audibility
Aided
Unaided
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For each band – Audibility x FIW = weighted audibility
SII = Sum of weighted audibility of all frequency bands
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Stelmachowicz et al. 2000
SII
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Estimate of aided or unaided audibility
Can be applied to transfer functions to
predict speech recognition * * Some restrictions may apply
• Transfer functions may have been developed on adults with normal hearing.
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Audibility is related to degree of hearing loss
Hearing aid use is assumed to be full time
Sininger et al. 2010
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100
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Age at HA Fit (Months)
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McCreery, Bentler & Roush, 2013
n = 195
Normative range from Bagatto et al. 2011
Open squares = > 5 dB deviation from DSL Filled circles = < 5 dB deviation from DSL 26% of ears < 0.65 SII
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Parent report = 10.84 hours Data logging = 8.3 hours Difference = 2.6 hours Range = 2-10 hours Predicted by age -Younger age = larger prediction error
Walker et al, LSHSS, 2012
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Car Public Daycare
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Walker, et al., LSHSS 2012
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Parent report and data logging are similar
Agreement improves as child gets older
Significant variability in data logging for parents reporting “full-time use”
Ask specific questions about use
How many hours?
What situations are easiest/most challenging?
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Controlling for Unaided SII
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Increasing audibility with hearing aids helps speech understanding in background noise
Hearing aid use is confounded by degree of hearing loss
The relationship between word recognition in noise and language depends on degree of hearing loss
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Audibility
Ear canal growth
▪ Thresholds
▪ Hearing aid output
Hearing aid use
Increasing use with age
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1 O First Visit Last Visit
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Entire group (n = 279)
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1 2
Low Increasing
High Non-Increasing
High Increasing
High Decreasing
77% 13%
13%
13%
First Visit Last Visit
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How do audibility and hearing aid use affect outcomes?
How does early auditory experience influence listening and learning at school age?
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