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Research Articles

Functionally-based screening criteria for hearing-critical jobs based on the Hearing in Noise Test

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Pages 319-328 | Received 04 Jan 2008, Published online: 07 Jul 2009
 

Abstract

Effective communication is a crucial requirement in many workplaces to ensure safe and effective operations. Often, critical verbal communications are carried out in noise, which can be very challenging, particularly for individuals with hearing loss. Diagnostic measures of hearing, such as the audiogram, are not adequate to make accurate predictions of speech intelligibility in real-world environments for specific workers, and thus are not generally suitable as a basis for making employment decisions. Instead, the Hearing in Noise Test (HINT) has been identified and validated for use in predicting speech intelligibility in a wide range of communication environments. The approach to validation of the HINT takes into account the expected voice level of the talker, the communication distance between the talker and the listener, and a statistical model of speech intelligibility in real-world occupational noises. For each hearing-critical task, a HINT screening threshold score is derived upon specification of the minimum level of performance required of the workers. The HINT is available in several languages, so the tools developed are applicable in a wide range of settings, including multilingual workplaces.

Abbreviations
HINT=

Hearing in Noise Test

HC=

Hearing-critical

SME=

Subject matter expert

DFO=

Department of Fisheries and Oceans Canada

SRT=

Speech recognition threshold

S/N=

Signal-to-noise

PI=

Performance-intensity

Abbreviations
HINT=

Hearing in Noise Test

HC=

Hearing-critical

SME=

Subject matter expert

DFO=

Department of Fisheries and Oceans Canada

SRT=

Speech recognition threshold

S/N=

Signal-to-noise

PI=

Performance-intensity

Sumario

Una prueba holandesa de frases (LIST) y una prueba holandesa de números (LINT) han sido desarrolladas y validadas para la medición exacta de los umbrales de recepción del lenguaje (SRT) en silencio y en ruido, en individuos con alteración auditiva severa y en receptores de implante coclear, en Flandes y en los Países Bajos. El LIST consiste de 35 listas de 10 frases con igual dificultad conocida presentadas por una hablante femenina, mientras que el LINT consiste de 400 números (1-100) y es presentado por dos hablantes masculinos y dos femeninas. Se determinaron los valores normativos a tasas S/R fijas y utilizando el métodos adaptativo (Plomp & Mimpen, 1979), rindiendo resultados idénticos en cuanto al SRT y la pendiente. Para el LIST, los SRT amplificados promedio fueron 27.1 (0.9) dB SPL en silencio y −7.8 dB (0.2) SNR en ruido. Además, el LIST en ruido mostró una función de discriminación empinada (17 %/dB) y una buena confiabilidad (desviación estándar intra-sujeto=1.2 dB). Para el LINT, los SRT promedio en silencio con amplificación fueron de 20.7 (0.9) dB SPL y alrededor de −9.0 dB de SNR en ruido. De nuevo, las pendientes de las funciones de desempeño/intensidad fueron relativamente empinada, p.e., 8.5 %/dB en silencio y 15.2 %/dB en ruido, sugiriendo que el LINT es exacto y eficiente, y por lo tanto, capaz de cambios sutiles en el desempeño. Los primeros datos con sujetos con implante coclear muestran que tanto el LIST como el LINT son factibles y capaces de mapear una amplio rango de discapacidades auditivas.

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