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Original Article

Survey on hearing aid outcome in Switzerland: Associations with type of fitting (bilateral/unilateral), level of hearing aid signal processing, and hearing loss

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Pages 333-346 | Received 15 Jan 2009, Accepted 09 Nov 2009, Published online: 12 Apr 2010
 

Abstract

Abstract

The present investigation further analysed results of a previously reported survey with a large sample of hearing aid owners (Citation) to determine the individual and technological factors related to hearing aid outcome. In particular the associations of hearing loss, level of signal processing, and fitting type (bilateral versus unilateral fitting) with hearing aid use, satisfaction with and management of the aid were evaluated. A sub-group with symmetrical hearing loss was analysed (n = 6027). Regular use was more frequent in bilateral users and in owners of devices with more complex signal processing, but the strongest determinant of regular use was severity of hearing loss. Satisfaction was higher in the group wearing simple devices, while fitting type and degree of hearing loss had no influence on satisfaction rates. Moderate and severe hearing loss was associated more frequently with poor management of the aid than mild hearing loss. It was concluded that bilateral amplification and advanced signal processing features may contribute to successful hearing aid fitting, but the resulting differences must be considered to be relatively small.

Sumario

La presente investigación analiza más a fondo los resultados previamente reportados de una encuesta realizada a una muestra grande de dueños de auxiliares auditivos (Citation) para determinar los factores individuales y tecnológicos relacionados con el resultado de dicha adaptación. En particular, se evaluó la asociación de la hipoacusia, el nivel de procesamiento de la señal, el tipo de adaptación (bilateral versus unilateral), con el uso del auxiliar auditivo, la satisfacción y el manejo de dicho audífono. Un sub-grupo con hipoacusia simétrica fue analizado (n = 6027). El uso regular fue más frecuente en usuarios bilaterales y en dueños de dispositivos con procesamiento más complejo de la señal, pero el determinante más fuerte de uso frecuente fue la severidad de la pérdida auditiva. La satisfacción fue mayor en el grupo que usaba dispositivos simples, en tanto que el tipo de adaptación o el grado de hipoacusia no tuvieron influencia en la tasa de satisfacción. Las hipoacusias moderadas y severas se asociaron más frecuentemente con un pobre manejo del auxiliar que las pérdidas leves. Se concluyó que la amplificación bilateral y los rasgos de procesamiento avanzado de la señal pueden contribuir con una adaptación exitosa de un auxiliar auditivo, aunque las diferencias resultantes pueden considerarse relativamente pequeñas.

Acknowledgements

We wish to thank Christian Schindler for assistance with statistical analyses. This work was supported by grants from Amplifon AG Schweiz, Charles Holland Foundation Milano, Lotteriefonds Baselland, and Eidgenössische Finanzkontrolle Bern. The study was conducted independent of the funding agencies. Amplifon supplied addresses of their customers and provided data on hearing loss and hearing aids for respondents. Amplifon did not participate in data collection, data analysis, or interpretation of results. The Swiss Federal Audit Office (Eidgenössische Finanzkontrolle) received a report of the results for an evaluation of the provision of hearing aids supported by the social insurance system in Switzerland.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

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