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Psychometric properties of the Tinnitus Functional Index (TFI): assessment in a UK research volunteer population

Fackrell, Kathryn L.; Hall, Deborah A.; Barry, Johanna G.; Hoare, Derek J.

Authors

Deborah A. Hall

Johanna G. Barry

DEREK HOARE derek.hoare@nottingham.ac.uk
Associate Professor in Hearing Sciences



Abstract

Objectives

Questionnaires are essential for measuring tinnitus severity and intervention-related change but there is no standard instrument used routinely in research settings. Most tinnitus questionnaires are optimised for measuring severity but not change. However, the Tinnitus Functional Index (TFI) claims to be optimised for both. It has not however been fully validated for research purposes. Here we evaluate the relevant psychometric properties of the TFI, specifically the questionnaire factor structure, reproducibility, validity and responsiveness guided by quality criteria for the measurement properties of health-related questionnaires.

Methods

The study involved a retrospective analysis of data collected for 294 members of the general public who participated in a randomised controlled trial of a novel tinnitus device (ClinicalTrials.gov Identifier: NCT01541969). Participants completed up to eight commonly used assessment questionnaires including the TFI, Tinnitus Handicap Inventory (THI), Tinnitus Handicap Questionnaire (THQ), a Visual Analogue Scale of loudness (VAS-Loudness), Percentage Annoyance question, the Beck's Depression Inventory (BDI), Beck's Anxiety Inventory (BAI), and the World Health Organisation Quality of Life-Bref (WHOQOL-BREF). A series of analyses assessed the study objectives. Forty four participants completed the TFI at a second visit (within 7–21 days and before receiving any intervention) providing data for reproducibility assessments.

Results

The 8-factor structure was not fully confirmed for this general (non-clinical) population. Whilst it was acceptable standalone subscale, the ‘auditory’ factor showed poor loading with the higher order factor ‘functional impact of tinnitus’. Reproducibility assessments for the overall TFI indicate high internal consistency (α = 0.80) and extremely high reliability (ICC: 0.91), whilst agreement was borderline acceptable (93%). Construct validity was demonstrated by high correlations between scores on the TFI and THI (r = 0.82) and THQ (r = 0.82), moderate correlations with VAS-L (r = 0.46), PR-A (r = 0.58), BDI (r = 0.57), BAI (r = 0.39) and WHOQOL (r = −0.48). Floor effects were observed for more than 50% of the items. A smallest detectable change score of 22.4 is proposed for the TFI global score.

Conclusion

Even though the proposed 8-factor structure was not fully confirmed for this population, the TFI appears to cover multiple symptom domains, and to measure the construct of tinnitus with an excellent reliability in distinguishing between patients. While the TFI may discriminate those whose tinnitus is not a problem, floor effects in many items means it is less appropriate as a measure of change in this subgroup. Further investigation is needed to determine whether these effects are relevant in other populations.

Citation

Fackrell, K. L., Hall, D. A., Barry, J. G., & Hoare, D. J. (2016). Psychometric properties of the Tinnitus Functional Index (TFI): assessment in a UK research volunteer population. Hearing Research, 335, https://doi.org/10.1016/j.heares.2015.09.009

Journal Article Type Article
Acceptance Date Sep 22, 2015
Online Publication Date Sep 28, 2015
Publication Date May 31, 2016
Deposit Date Jul 28, 2017
Publicly Available Date Jul 28, 2017
Journal Hearing Research
Print ISSN 0378-5955
Electronic ISSN 1878-5891
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 335
DOI https://doi.org/10.1016/j.heares.2015.09.009
Keywords Outcome instruments, Reproducibility, Reliability, Confirmatory Factor Analysis, Convergent validity, Discriminant validity, Responsiveness
Public URL https://nottingham-repository.worktribe.com/output/787681
Publisher URL http://www.sciencedirect.com/science/article/pii/S0378595515001975

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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