An item response analysis of the international restless legs syndrome study group rating scale for restless legs syndrome

Glen R. Wunderlich; Kenneth R. Evans; Terrence Sills; Stephane Pollentier; Juergen Reess; Richard P. Allen; Wayne Hening; Arthur S. Walters; Charles Adler; Murat Aksu; Richard P. Allen; Melanie Anderson; Sonia Ancoli Israel; William Bara Jimenez; Claudio Bassetti; Donald L. Bliwise; Lauren L. Broch; David Buchholz; Sudhansun Chokroverty; Sandra Clavadetscher; Giorgio Coccagna; Marco Tulio de Mello; Al W. de Weerd; Anjana Dhar; Bruce Ehrenberg; Ilonka Eisensehr; Karl Ekbom; Diego Garcia-Borreguero; Paul Gurecki; Mark Hallett; Wayne A. Hening; Linda Hirsch; Birgit Hogl; Jun Horiguchi; Magdolna Hornyak; Meir Kryger; Oscar Larrosa; Cheryl LeBrocq; Joseph F. Lipinski; Ake Ljungdahl; Elio Lugaresi; Ahmed Masood; Filomena Miele; Pasquale Montagna; Sarah Mosko; Stephanie Newman; Wolfgang H. Oertel; Shaun O'Keeffe; Alessandro Oldani; William G. Ondo; Barbara Phillips; Daniel Picchietti; Giuseppe Plazzi; J. Steven Poceta; Federica Provini; Cynthia Reiners; Gerald B. Rich; Roselyne M. Rijsman; Ray Rosen; David B. Rye; Larry Scrima; Renata Shafor; Denise Sharon; Michael Silber; Robert Skowrow; Robert Smith; Karin Stiasny; Claudia Trenkwalder; Sergio Tufik; Zebra Vanek; Ulrich Voderholzer; Mary Wagner; Thomas C. Wetter; Juliane Winkelmann; Rochelle Zak; Marco Zucconi

doi:10.1016/j.sleep.2004.10.010

An item response analysis of the international restless legs syndrome study group rating scale for restless legs syndrome

Glen R. Wunderlich, Kenneth R. Evans, Terrence Sills, Stephane Pollentier, Juergen Reess, Richard P. Allen, Wayne Hening, Arthur S. Walters, Charles Adler, Murat Aksu, Richard P. Allen, Melanie Anderson, Sonia Ancoli Israel, William Bara Jimenez, Claudio Bassetti, Donald L. Bliwise, Lauren L. Broch, David Buchholz, Sudhansun Chokroverty, Sandra ClavadetscherGiorgio Coccagna, Marco Tulio de Mello, Al W. de Weerd, Anjana Dhar, Bruce Ehrenberg, Ilonka Eisensehr, Karl Ekbom, Diego Garcia-Borreguero, Paul Gurecki, Mark Hallett, Wayne A. Hening, Linda Hirsch, Birgit Hogl, Jun Horiguchi, Magdolna Hornyak, Meir Kryger, Oscar Larrosa, Cheryl LeBrocq, Joseph F. Lipinski, Ake Ljungdahl, Elio Lugaresi, Ahmed Masood, Filomena Miele, Pasquale Montagna, Sarah Mosko, Stephanie Newman, Wolfgang H. Oertel, Shaun O'Keeffe, Alessandro Oldani, William G. Ondo, Barbara Phillips, Daniel Picchietti, Giuseppe Plazzi, J. Steven Poceta, Federica Provini, Cynthia Reiners, Gerald B. Rich, Roselyne M. Rijsman, Ray Rosen, David B. Rye, Larry Scrima, Renata Shafor, Denise Sharon, Michael Silber, Robert Skowrow, Robert Smith, Karin Stiasny, Claudia Trenkwalder, Sergio Tufik, Zebra Vanek, Ulrich Voderholzer, Mary Wagner, Thomas C. Wetter, Juliane Winkelmann, Rochelle Zak, Marco Zucconi

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Background and purpose: Restless legs syndrome (RLS) is a common central nervous system disorder; however, there is currently a lack of well-validated and easily-administered measures of RLS severity available. The International Restless Legs Syndrome Study Group has recently developed a 10-item scale to meet this need. The International Restless Legs Severity Scale (IRLS) has been shown to have a high degree of reliability, validity, and internal consistency. In order to further demonstrate the validity of the IRLS, the present study examined the relationship between scores on individual IRLS items and overall RLS severity. Patients and methods: The 10-item IRLS was administered to 19 6 RLS patients. Option characteristic curves (the probability of scoring different options for a given item as a function of overall IRLS score) were generated in order to illustrate the scoring patterns for each item across the range of total RLS severity. Item characteristic curves (the expected score on an item as a function of overall IRLS score) were also generated to illustrate the relationship between scores on the individual items and total RLS severity. Results: The IRLS items demons trated excellent item response properties, with option and item characteristic curves closely approximating those of an ideal item. Item 3 (relief of arm or leg discomfort from moving around) was the most problematic item in that a 'floor' effect was evident; however, the item response characteristics for this item were still acceptable. Conclusions: Each IRLS item showed a good relationship between responses on that item and overall RLS severity, providing further evidence for the validity of the IRLS as a measure of RLS severity in RLS patients.

Original language	English (US)
Pages (from-to)	131-139
Number of pages	9
Journal	Sleep Medicine
Volume	6
Issue number	2
DOIs	https://doi.org/10.1016/j.sleep.2004.10.010
State	Published - Mar 2005
Externally published	Yes

Keywords

IRLSSG
Item response theory
RLS
Sleep disorders
Validation studies

ASJC Scopus subject areas

General Medicine

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10.1016/j.sleep.2004.10.010

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Wunderlich, G. R., Evans, K. R., Sills, T., Pollentier, S., Reess, J., Allen, R. P., Hening, W., Walters, A. S., Adler, C., Aksu, M., Allen, R. P., Anderson, M., Israel, S. A., Jimenez, W. B., Bassetti, C., Bliwise, D. L., Broch, L. L., Buchholz, D., Chokroverty, S., ... Zucconi, M. (2005). An item response analysis of the international restless legs syndrome study group rating scale for restless legs syndrome. Sleep Medicine, 6(2), 131-139. https://doi.org/10.1016/j.sleep.2004.10.010

Wunderlich, GR, Evans, KR, Sills, T, Pollentier, S, Reess, J, Allen, RP, Hening, W, Walters, AS, Adler, C, Aksu, M, Allen, RP, Anderson, M, Israel, SA, Jimenez, WB, Bassetti, C, Bliwise, DL, Broch, LL, Buchholz, D, Chokroverty, S, Clavadetscher, S, Coccagna, G, de Mello, MT, de Weerd, AW, Dhar, A, Ehrenberg, B, Eisensehr, I, Ekbom, K, Garcia-Borreguero, D, Gurecki, P, Hallett, M, Hening, WA, Hirsch, L, Hogl, B, Horiguchi, J, Hornyak, M, Kryger, M, Larrosa, O, LeBrocq, C, Lipinski, JF, Ljungdahl, A, Lugaresi, E, Masood, A, Miele, F, Montagna, P, Mosko, S, Newman, S, Oertel, WH, O'Keeffe, S, Oldani, A, Ondo, WG, Phillips, B, Picchietti, D, Plazzi, G, Poceta, JS, Provini, F, Reiners, C, Rich, GB, Rijsman, RM, Rosen, R, Rye, DB, Scrima, L, Shafor, R, Sharon, D, Silber, M, Skowrow, R, Smith, R, Stiasny, K, Trenkwalder, C, Tufik, S, Vanek, Z, Voderholzer, U, Wagner, M, Wetter, TC, Winkelmann, J, Zak, R & Zucconi, M 2005, 'An item response analysis of the international restless legs syndrome study group rating scale for restless legs syndrome', Sleep Medicine, vol. 6, no. 2, pp. 131-139. https://doi.org/10.1016/j.sleep.2004.10.010

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title = "An item response analysis of the international restless legs syndrome study group rating scale for restless legs syndrome",

abstract = "Background and purpose: Restless legs syndrome (RLS) is a common central nervous system disorder; however, there is currently a lack of well-validated and easily-administered measures of RLS severity available. The International Restless Legs Syndrome Study Group has recently developed a 10-item scale to meet this need. The International Restless Legs Severity Scale (IRLS) has been shown to have a high degree of reliability, validity, and internal consistency. In order to further demonstrate the validity of the IRLS, the present study examined the relationship between scores on individual IRLS items and overall RLS severity. Patients and methods: The 10-item IRLS was administered to 19 6 RLS patients. Option characteristic curves (the probability of scoring different options for a given item as a function of overall IRLS score) were generated in order to illustrate the scoring patterns for each item across the range of total RLS severity. Item characteristic curves (the expected score on an item as a function of overall IRLS score) were also generated to illustrate the relationship between scores on the individual items and total RLS severity. Results: The IRLS items demons trated excellent item response properties, with option and item characteristic curves closely approximating those of an ideal item. Item 3 (relief of arm or leg discomfort from moving around) was the most problematic item in that a 'floor' effect was evident; however, the item response characteristics for this item were still acceptable. Conclusions: Each IRLS item showed a good relationship between responses on that item and overall RLS severity, providing further evidence for the validity of the IRLS as a measure of RLS severity in RLS patients.",

keywords = "IRLSSG, Item response theory, RLS, Sleep disorders, Validation studies",

author = "Wunderlich, {Glen R.} and Evans, {Kenneth R.} and Terrence Sills and Stephane Pollentier and Juergen Reess and Allen, {Richard P.} and Wayne Hening and Walters, {Arthur S.} and Charles Adler and Murat Aksu and Allen, {Richard P.} and Melanie Anderson and Israel, {Sonia Ancoli} and Jimenez, {William Bara} and Claudio Bassetti and Bliwise, {Donald L.} and Broch, {Lauren L.} and David Buchholz and Sudhansun Chokroverty and Sandra Clavadetscher and Giorgio Coccagna and {de Mello}, {Marco Tulio} and {de Weerd}, {Al W.} and Anjana Dhar and Bruce Ehrenberg and Ilonka Eisensehr and Karl Ekbom and Diego Garcia-Borreguero and Paul Gurecki and Mark Hallett and Hening, {Wayne A.} and Linda Hirsch and Birgit Hogl and Jun Horiguchi and Magdolna Hornyak and Meir Kryger and Oscar Larrosa and Cheryl LeBrocq and Lipinski, {Joseph F.} and Ake Ljungdahl and Elio Lugaresi and Ahmed Masood and Filomena Miele and Pasquale Montagna and Sarah Mosko and Stephanie Newman and Oertel, {Wolfgang H.} and Shaun O'Keeffe and Alessandro Oldani and Ondo, {William G.} and Barbara Phillips and Daniel Picchietti and Giuseppe Plazzi and Poceta, {J. Steven} and Federica Provini and Cynthia Reiners and Rich, {Gerald B.} and Rijsman, {Roselyne M.} and Ray Rosen and Rye, {David B.} and Larry Scrima and Renata Shafor and Denise Sharon and Michael Silber and Robert Skowrow and Robert Smith and Karin Stiasny and Claudia Trenkwalder and Sergio Tufik and Zebra Vanek and Ulrich Voderholzer and Mary Wagner and Wetter, {Thomas C.} and Juliane Winkelmann and Rochelle Zak and Marco Zucconi",

year = "2005",

month = mar,

doi = "10.1016/j.sleep.2004.10.010",

language = "English (US)",

volume = "6",

pages = "131--139",

journal = "Sleep Medicine",

issn = "1389-9457",

publisher = "Elsevier",

number = "2",

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TY - JOUR

T1 - An item response analysis of the international restless legs syndrome study group rating scale for restless legs syndrome

AU - Wunderlich, Glen R.

AU - Evans, Kenneth R.

AU - Sills, Terrence

AU - Pollentier, Stephane

AU - Reess, Juergen

AU - Allen, Richard P.

AU - Hening, Wayne

AU - Walters, Arthur S.

AU - Adler, Charles

AU - Aksu, Murat

AU - Allen, Richard P.

AU - Anderson, Melanie

AU - Israel, Sonia Ancoli

AU - Jimenez, William Bara

AU - Bassetti, Claudio

AU - Bliwise, Donald L.

AU - Broch, Lauren L.

AU - Buchholz, David

AU - Chokroverty, Sudhansun

AU - Clavadetscher, Sandra

AU - Coccagna, Giorgio

AU - de Mello, Marco Tulio

AU - de Weerd, Al W.

AU - Dhar, Anjana

AU - Ehrenberg, Bruce

AU - Eisensehr, Ilonka

AU - Ekbom, Karl

AU - Garcia-Borreguero, Diego

AU - Gurecki, Paul

AU - Hallett, Mark

AU - Hening, Wayne A.

AU - Hirsch, Linda

AU - Hogl, Birgit

AU - Horiguchi, Jun

AU - Hornyak, Magdolna

AU - Kryger, Meir

AU - Larrosa, Oscar

AU - LeBrocq, Cheryl

AU - Lipinski, Joseph F.

AU - Ljungdahl, Ake

AU - Lugaresi, Elio

AU - Masood, Ahmed

AU - Miele, Filomena

AU - Montagna, Pasquale

AU - Mosko, Sarah

AU - Newman, Stephanie

AU - Oertel, Wolfgang H.

AU - O'Keeffe, Shaun

AU - Oldani, Alessandro

AU - Ondo, William G.

AU - Phillips, Barbara

AU - Picchietti, Daniel

AU - Plazzi, Giuseppe

AU - Poceta, J. Steven

AU - Provini, Federica

AU - Reiners, Cynthia

AU - Rich, Gerald B.

AU - Rijsman, Roselyne M.

AU - Rosen, Ray

AU - Rye, David B.

AU - Scrima, Larry

AU - Shafor, Renata

AU - Sharon, Denise

AU - Silber, Michael

AU - Skowrow, Robert

AU - Smith, Robert

AU - Stiasny, Karin

AU - Trenkwalder, Claudia

AU - Tufik, Sergio

AU - Vanek, Zebra

AU - Voderholzer, Ulrich

AU - Wagner, Mary

AU - Wetter, Thomas C.

AU - Winkelmann, Juliane

AU - Zak, Rochelle

AU - Zucconi, Marco

PY - 2005/3

Y1 - 2005/3

N2 - Background and purpose: Restless legs syndrome (RLS) is a common central nervous system disorder; however, there is currently a lack of well-validated and easily-administered measures of RLS severity available. The International Restless Legs Syndrome Study Group has recently developed a 10-item scale to meet this need. The International Restless Legs Severity Scale (IRLS) has been shown to have a high degree of reliability, validity, and internal consistency. In order to further demonstrate the validity of the IRLS, the present study examined the relationship between scores on individual IRLS items and overall RLS severity. Patients and methods: The 10-item IRLS was administered to 19 6 RLS patients. Option characteristic curves (the probability of scoring different options for a given item as a function of overall IRLS score) were generated in order to illustrate the scoring patterns for each item across the range of total RLS severity. Item characteristic curves (the expected score on an item as a function of overall IRLS score) were also generated to illustrate the relationship between scores on the individual items and total RLS severity. Results: The IRLS items demons trated excellent item response properties, with option and item characteristic curves closely approximating those of an ideal item. Item 3 (relief of arm or leg discomfort from moving around) was the most problematic item in that a 'floor' effect was evident; however, the item response characteristics for this item were still acceptable. Conclusions: Each IRLS item showed a good relationship between responses on that item and overall RLS severity, providing further evidence for the validity of the IRLS as a measure of RLS severity in RLS patients.

AB - Background and purpose: Restless legs syndrome (RLS) is a common central nervous system disorder; however, there is currently a lack of well-validated and easily-administered measures of RLS severity available. The International Restless Legs Syndrome Study Group has recently developed a 10-item scale to meet this need. The International Restless Legs Severity Scale (IRLS) has been shown to have a high degree of reliability, validity, and internal consistency. In order to further demonstrate the validity of the IRLS, the present study examined the relationship between scores on individual IRLS items and overall RLS severity. Patients and methods: The 10-item IRLS was administered to 19 6 RLS patients. Option characteristic curves (the probability of scoring different options for a given item as a function of overall IRLS score) were generated in order to illustrate the scoring patterns for each item across the range of total RLS severity. Item characteristic curves (the expected score on an item as a function of overall IRLS score) were also generated to illustrate the relationship between scores on the individual items and total RLS severity. Results: The IRLS items demons trated excellent item response properties, with option and item characteristic curves closely approximating those of an ideal item. Item 3 (relief of arm or leg discomfort from moving around) was the most problematic item in that a 'floor' effect was evident; however, the item response characteristics for this item were still acceptable. Conclusions: Each IRLS item showed a good relationship between responses on that item and overall RLS severity, providing further evidence for the validity of the IRLS as a measure of RLS severity in RLS patients.

KW - IRLSSG

KW - Item response theory

KW - RLS

KW - Sleep disorders

KW - Validation studies

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DO - 10.1016/j.sleep.2004.10.010

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EP - 139

JO - Sleep Medicine

JF - Sleep Medicine

IS - 2

ER -

An item response analysis of the international restless legs syndrome study group rating scale for restless legs syndrome

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