International Outcome Inventory for Hearing Aids: Data From a Large Swedish Quality Register Database Purpose The purpose of this study was to analyze a database of completed International Outcome Inventory for Hearing Aids (IOI-HA) questionnaires obtained from over 100,000 clients fitted with new hearing aids in Sweden during the period of 2012–2016. Mean IOI-HA total scores were correlated with degree of hearing loss, unilateral ... Research Article
Research Article  |   October 12, 2017
International Outcome Inventory for Hearing Aids: Data From a Large Swedish Quality Register Database
 
Author Affiliations & Notes
  • Stig Arlinger
    Division of Technical Audiology, Department of Clinical and Experimental Medicine, Linköping University, Sweden
    Linnaeus Centre, Swedish Institute for Disability Research, Department of Behavioural Sciences and Learning, Linköping University, Sweden
  • Peter Nordqvist
    Research Institute Hörselbron, School of Computer Science and Communication, Royal Institute of Technology, Stockholm, Sweden
  • Marie Öberg
    Division of Technical Audiology, Department of Clinical and Experimental Medicine, Linköping University, Sweden
    Linnaeus Centre, Swedish Institute for Disability Research, Department of Behavioural Sciences and Learning, Linköping University, Sweden
    Department of Otorhinolaryngology in Linköping, Anaesthetics, Operations and Specialty Surgery Centre, Region Östergötland, Sweden
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Stig Arlinger: stig.arlinger@liu.se
  • Editor-in-Chief: Sumitrajit Dhar
    Editor-in-Chief: Sumitrajit Dhar×
Article Information
Hearing Disorders / Hearing Aids, Cochlear Implants & Assistive Technology / Cultural & Linguistic Diversity / Special Issue: Select Papers From the Hearing Across the Lifespan (HEAL) 2016 Conference / Research Articles
Research Article   |   October 12, 2017
International Outcome Inventory for Hearing Aids: Data From a Large Swedish Quality Register Database
American Journal of Audiology, October 2017, Vol. 26, 443-450. doi:10.1044/2017_AJA-16-0123
History: Received December 13, 2016 , Revised April 15, 2017 , Accepted April 24, 2017
 
American Journal of Audiology, October 2017, Vol. 26, 443-450. doi:10.1044/2017_AJA-16-0123
History: Received December 13, 2016; Revised April 15, 2017; Accepted April 24, 2017

Purpose The purpose of this study was to analyze a database of completed International Outcome Inventory for Hearing Aids (IOI-HA) questionnaires obtained from over 100,000 clients fitted with new hearing aids in Sweden during the period of 2012–2016. Mean IOI-HA total scores were correlated with degree of hearing loss, unilateral versus bilateral fitting, first-time versus return clients, gender, and variation among dispensing clinics. The correlations with expectations, service quality, and technical functioning of the hearing aids were also analyzed.

Method Questionnaires containing the 7 IOI-HA items as well as questions concerning some additional issues were mailed to clients 3–6 months after fitting of new hearing aids. The questionnaires were returned to and analyzed by an independent research institute.

Results More than 100 dispensing clinics nationwide take part in this project. A response rate of 52.6% resulted in 106,631 data sets after excluding incomplete questionnaires. Forty-six percent of the responders were women, and 54% were men. The largest difference in mean score (0.66) was found for the IOI-HA item “use” between return clients and first-time users. Women reported significantly higher (better) scores for the item “impact on others” compared with men. The bilaterally fitted subgroup reported significantly higher scores for all 7 items compared with the unilaterally fitted subgroup. Experienced users produced higher scores on benefit and satisfaction items, whereas first-time users gave higher scores for residual problems. No correlation was found between mean IOI-HA total score and average hearing threshold level (pure-tone average [PTA]). Mean IOI-HA total scores were found to correlate significantly with perceived service quality of the dispensing center and with the technical functionality of the hearing aids.

Conclusions When comparing mean IOI-HA total scores from different studies or between groups, differences with regard to hearing aid experience, gender, and unilateral versus bilateral fitting have to be considered. No correlation was found between mean IOI-HA total score and degree of hearing loss in terms of PTA. Thus, PTA is not a reliable predictor of benefit and satisfaction of hearing aid provision as represented by the IOI-HA items. Identification of a specific lower fence in PTA for hearing aid candidacy is therefore to be avoided. Large differences were found in mean IOI-HA total scores related to different dispensing centers.

Acknowledgments
We thank all counties in Sweden that participated in the quality register, the Swedish Association of Hard of Hearing People for contributing with a research grant, and the Board of the Quality Register for valuable input to the project.
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