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Tinnitus functional index: validation of the German version for Switzerland.
Health Qual Life Outcomes. 2017 May 05; 15(1):94.HQ

Abstract

BACKGROUND

Different standardized questionnaires are used to assess tinnitus severity, making comparisons across studies difficult. These questionnaires are also used to measure treatment-related changes in tinnitus although they were not designed for this purpose. To solve these problems, a new questionnaire - the Tinnitus Functional Index (TFI) - has been established. The TFI is highly responsive to treatment-related change and promises to be the new gold standard in tinnitus evaluation. The aim of the current study was to validate a German version of the TFI for a German-speaking population in Switzerland.

METHODS

At the ENT department of the University Hospital Zurich, 264 subjects completed an online survey including the German version for Switzerland of TFI, Tinnitus Handicap Inventory (THI), Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI) and sociodemographic variables. Internal consistency of the TFI was calculated with Cronbach's alpha coefficient. Pearson correlation coefficients were used for the test-retest reliability of the TFI and to investigate convergent and discriminant validity between the THI and the BDI and BAI, respectively. Factor analysis was assessed using a principal component analysis with oblique rotation. The different factors extracted were then compared with the original questionnaire.

RESULTS

The German version of the TFI for Switzerland showed an excellent internal consistency (Cronbach's alpha of 0.97) and an excellent test-retest reliability of 0.91. The convergent validity with THI was high (r = 0.86). The discriminant validity with BAI and BDI showed moderate results (BAI: r = 0.60 and BDI: r = 0.65). In the factor analysis only five factors with one main factor could be extracted instead of eight factors as described in the original version. Nevertheless, relations to the original eight subscales could be demonstrated.

CONCLUSION

The German version of the TFI for Switzerland is a suitable instrument for measuring the impact of tinnitus. The reliability and validity of this version are comparable with the original version of the TFI. Although this study showed only five factors in the factor analysis, relations to the original eight subscales were identified. Therefore, the German version of the TFI for Switzerland can deliver relevant information regarding the different tinnitus domains.

TRIAL REGISTRATION

Clinical trial registration number on clinicaltrial.gov: NCT01837368 .

Authors+Show Affiliations

Department of Otorhinolaryngology, University Hospital of Zurich, Frauenklinikstrasse 24, CH-8091, Zurich, Switzerland. nicole.peter-siegrist@usz.ch.Department of Otorhinolaryngology, University Hospital of Zurich, Frauenklinikstrasse 24, CH-8091, Zurich, Switzerland.Department of Otorhinolaryngology, University Hospital of Zurich, Frauenklinikstrasse 24, CH-8091, Zurich, Switzerland.Department of Psychology, University of Zurich, Andreasstrasse 15, CH-8050, Zurich, Switzerland.Department of Psychiatry and Psychotherapy, University Hospital of Zurich, Haldenbachstrasse 18, CH-8091, Zurich, Switzerland.Department of Psychiatry and Psychotherapy, University Hospital of Zurich, Haldenbachstrasse 18, CH-8091, Zurich, Switzerland.

Pub Type(s)

Journal Article
Observational Study
Validation Study

Language

eng

PubMed ID

28476163

Citation

Peter, Nicole, et al. "Tinnitus Functional Index: Validation of the German Version for Switzerland." Health and Quality of Life Outcomes, vol. 15, no. 1, 2017, p. 94.
Peter N, Kleinjung T, Jeker R, et al. Tinnitus functional index: validation of the German version for Switzerland. Health Qual Life Outcomes. 2017;15(1):94.
Peter, N., Kleinjung, T., Jeker, R., Meyer, M., Klaghofer, R., & Weidt, S. (2017). Tinnitus functional index: validation of the German version for Switzerland. Health and Quality of Life Outcomes, 15(1), 94. https://doi.org/10.1186/s12955-017-0669-x
Peter N, et al. Tinnitus Functional Index: Validation of the German Version for Switzerland. Health Qual Life Outcomes. 2017 May 5;15(1):94. PubMed PMID: 28476163.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Tinnitus functional index: validation of the German version for Switzerland. AU - Peter,Nicole, AU - Kleinjung,Tobias, AU - Jeker,Raphael, AU - Meyer,Martin, AU - Klaghofer,Richard, AU - Weidt,Steffi, Y1 - 2017/05/05/ PY - 2016/11/21/received PY - 2017/04/27/accepted PY - 2017/5/7/entrez PY - 2017/5/10/pubmed PY - 2017/8/31/medline KW - Beck anxiety index (BAI) KW - Beck depression index (BDI) KW - Subjective tinnitus loudness KW - Tinnitus KW - Tinnitus functional index (TFI) KW - Tinnitus handicap inventory (THI) KW - Validation SP - 94 EP - 94 JF - Health and quality of life outcomes JO - Health Qual Life Outcomes VL - 15 IS - 1 N2 - BACKGROUND: Different standardized questionnaires are used to assess tinnitus severity, making comparisons across studies difficult. These questionnaires are also used to measure treatment-related changes in tinnitus although they were not designed for this purpose. To solve these problems, a new questionnaire - the Tinnitus Functional Index (TFI) - has been established. The TFI is highly responsive to treatment-related change and promises to be the new gold standard in tinnitus evaluation. The aim of the current study was to validate a German version of the TFI for a German-speaking population in Switzerland. METHODS: At the ENT department of the University Hospital Zurich, 264 subjects completed an online survey including the German version for Switzerland of TFI, Tinnitus Handicap Inventory (THI), Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI) and sociodemographic variables. Internal consistency of the TFI was calculated with Cronbach's alpha coefficient. Pearson correlation coefficients were used for the test-retest reliability of the TFI and to investigate convergent and discriminant validity between the THI and the BDI and BAI, respectively. Factor analysis was assessed using a principal component analysis with oblique rotation. The different factors extracted were then compared with the original questionnaire. RESULTS: The German version of the TFI for Switzerland showed an excellent internal consistency (Cronbach's alpha of 0.97) and an excellent test-retest reliability of 0.91. The convergent validity with THI was high (r = 0.86). The discriminant validity with BAI and BDI showed moderate results (BAI: r = 0.60 and BDI: r = 0.65). In the factor analysis only five factors with one main factor could be extracted instead of eight factors as described in the original version. Nevertheless, relations to the original eight subscales could be demonstrated. CONCLUSION: The German version of the TFI for Switzerland is a suitable instrument for measuring the impact of tinnitus. The reliability and validity of this version are comparable with the original version of the TFI. Although this study showed only five factors in the factor analysis, relations to the original eight subscales were identified. Therefore, the German version of the TFI for Switzerland can deliver relevant information regarding the different tinnitus domains. TRIAL REGISTRATION: Clinical trial registration number on clinicaltrial.gov: NCT01837368 . SN - 1477-7525 UR - https://www.unboundmedicine.com/medline/citation/28476163/Tinnitus_functional_index:_validation_of_the_German_version_for_Switzerland_ L2 - https://hqlo.biomedcentral.com/articles/10.1186/s12955-017-0669-x DB - PRIME DP - Unbound Medicine ER -