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01-12-2020 | Facial Palsy | Short report

Health-related quality of life in facial palsy: translation and validation of the Dutch version Facial Disability Index

Authors: Martinus M. van Veen, Tessa E. Bruins, Madina Artan, Tanja Mooibroek-Leeuwerke, Carien H. G. Beurskens, Paul M. N. Werker, Pieter U. Dijkstra

Published in: Health and Quality of Life Outcomes | Issue 1/2020

Abstract

Purpose

Patient-reported outcome measures are essential in the evaluation of facial palsy. Aim of this study was to translate and validate the Facial Disability Index (FDI) for use in the Netherlands.

Methods

The FDI was translated into Dutch according to a forward-backward method. Construct validity was assessed by formulating 22 hypotheses regarding associations of FDI scores with the Facial Clinimetric Evaluation scale, the Synkinesis Assessment Questionnaire, the Short Form-12 and the Sunnybrook Facial Grading System. Validity was considered adequate if at least 75% (i.e. 17 out of 22) of the hypotheses were confirmed. Additionally, confirmatory factor analysis was performed. Cronbach’s α was calculated as a measure of internal consistency. Participants were asked to fill out the FDI a second time after 2 weeks to analyse test-retest reliability. Lastly, smallest detectable change was calculated.

Results

In total, 19 hypotheses (86.4%) were confirmed. Confirmatory factor analysis showed acceptable fit for the two factor structure of the original FDI (root mean square error of approximation = 0.064, standardized root mean square residual = 0.081, comparative fit index = 0.925, Chi-square = 50.22 with 34 degrees of freedom). Internal consistency for the FDI physical function scale was good (α > 0.720). Internal consistency for the FDI social/well-being scale was slightly less (α > 0.574). Test-retest reliability for both scales was good (intraclass correlation coefficients > 0.786). Smallest detectable change at the level of the individual was 17.6 points for the physical function and 17.7 points for the social/well-being function, and at group level 1.9 points for both scales.

Conclusion

The Dutch version FDI shows good psychometric properties. The relatively large values for individual smallest detectable change may limit clinical use. The translation and widespread use of the FDI in multiple languages can help to compare treatment results internationally.

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Title: Health-related quality of life in facial palsy: translation and validation of the Dutch version Facial Disability Index
Authors: Martinus M. van Veen
Tessa E. Bruins
Madina Artan
Tanja Mooibroek-Leeuwerke
Carien H. G. Beurskens
Paul M. N. Werker
Pieter U. Dijkstra
Publication date: 01-12-2020
Publisher: BioMed Central
Keyword: Facial Palsy
Published in: Health and Quality of Life Outcomes / Issue 1/2020
Electronic ISSN: 1477-7525
DOI: https://doi.org/10.1186/s12955-020-01502-0

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Health-related quality of life in facial palsy: translation and validation of the Dutch version Facial Disability Index

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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