Difference in SII provided by initial fit and NAL-NL2 and its relation to self-reported hearing aid outcomes

The speech intelligibility index (SII) is used to quantify the audibility of the speech. This study examined the relationship between self-reported hearing aid (HA) outcomes and the difference in aided SII (SII ) calculated from the initial fit (IF) gain and that prescribed as per the second generat...

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Bibliographic Details
Published in:International journal of audiology 2024-11, Vol.63 (11), p.900-907
Main Authors: Narayanan, Sreeram K, Rye, Palle, Houmøller, Sabina Storbjerg, Wolff, Anne, Hougaard, Dan Dupont, Gaihede, Michael, Schmidt, Jesper Hvass, Hammershøi, Dorte
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Adult
Aged
Aged, 80 and over
Auditory Threshold
Correction of Hearing Impairment - instrumentation
Female
Hearing Aids
Hearing Loss - diagnosis
Hearing Loss - psychology
Hearing Loss - rehabilitation
Humans
Male
Middle Aged
Persons With Hearing Impairments - psychology
Persons With Hearing Impairments - rehabilitation
Prospective Studies
Self Report
Signal-To-Noise Ratio
Speech Intelligibility
Speech Perception
Treatment Outcome
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Summary:The speech intelligibility index (SII) is used to quantify the audibility of the speech. This study examined the relationship between self-reported hearing aid (HA) outcomes and the difference in aided SII (SII ) calculated from the initial fit (IF) gain and that prescribed as per the second generation of National Acoustic Laboratory Non-Linear (NAL-NL2). A prospective observational study. The study included 718 first-time and 253 experienced HA users. All users had a valid real-ear measurement (REM) at three input levels (55, 65 and 80 dB SPL). The gain provided by IF was lower than NAL-NL2 at 55 and 65 dB SPL. IF gain exhibited reduced compression than NAL-NL2 as input levels increased from 55 to 80 dB SPL. On average, the SII provided by IF was significantly lower than that for NAL-NL2 at all input levels. The difference in SII between IF and NAL-NL2 at 80 dB SPL input level with 0 dB signal-to-noise ratio (SNR) turned out to be a predictor for self-reported outcome for first-time HA users. The study suggests that an SIIA close to that provided by NAL-NL2 at high input levels would be preferred to obtain a better self-reported outcome. .
ISSN:1499-2027
1708-8186
1708-8186
DOI:10.1080/14992027.2023.2291633