2026-06-14T03:36:06Zhttps://repisalud.isciii.es/rest/oai/requestoai:repisalud.isciii.es:20.500.12105/145172024-09-27T18:01:47Zcom_20.500.12105_2052com_20.500.12105_2051col_20.500.12105_19608
Repisalud
author
Kohnen, Ralf
author
Martínez-Martín, Pablo
author
Benes, Heike
author
Trenkwalder, Claudia
author
Högl, Birgit
author
Dunkl, Elmar
author
Walters, Arthur S
2022-05-25T09:47:18Z
2022-05-25T09:47:18Z
2016-08
Sleep Med. 2016 Aug;24:10-17.
10.1016/j.sleep.2016.04.019
1878-5506
Sleep Medicine
27810174
http://hdl.handle.net/20.500.12105/14517
Background: Due to the symptoms and the sleep disturbances it causes, Restless Legs Syndrome (RLS) has a negative impact on quality of life. Measurement of such impact can be performed by means of questionnaires, such as the Kohnen Restless Legs Syndrome-Quality of Life questionnaire (KRLS-QoL), a specific 12-item instrument that is self-applied by patients. The present study is aimed at performing a first formal validation study of this instrument. Methods: Eight hundred ninety-one patients were included for analysis. RLS severity was assessed by the International Restless Legs Scale (IRLS), Restless Legs Syndrome-6 scales (RLS-6), and Clinical Global Impression of Severity. In addition the Epworth Sleepiness Scale (ESS) was assessed. Acceptability, dimensionality, scaling assumptions, reliability, precision, hypotheses-related validity, and responsiveness were tested. Results: There were missing data in 3.58% patients. Floor and ceiling effects were low for the subscales, global evaluation, and summary index derived from items 1 to 11 after checking that scaling assumptions were met. Exploratory parallel factor analysis showed that the KRLS-QoL may be deemed unidimensional, ie, that all components of the scale are part of one overall general quality of life factor. Indexes of internal consistency (alpha = 0.88), item-total correlation (rS = 0.32-0.71), item homogeneity coefficient (0.41), and scale stability (ICC = 0.73) demonstrated a satisfactory reliability of the KRLS-QoL. Moderate or high correlations were obtained between KRLS-QoL scores and the IRLS, some components of the RLS-6, inter-KRLS-QoL domains, and global evaluations. Known-groups validity for severity levels grouping and responsiveness analysis results were satisfactory, the latter showing higher magnitudes of response for treated than for placebo arms. Conclusions: The KRLS-QoL was proven an acceptable, reliable, valid, and responsive measure to assess the impact of the RLS on quality of life.
eng
Health-related quality of life
IRLS
Kohnen Restless Legs Syndrome–Quality of Life questionnaire
RLS-6
Restless Legs Syndrome
Validation of the Kohnen Restless Legs Syndrome-Quality of Life instrument
journal article
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ValidationOfTheKohnen_2016.pdf
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ValidationOfTheKohnen_2016.pdf.txt