Sleep Related Questionnaires

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International Restless Legs Scale (IRLS)

Name of questionnaire International Restless Legs Scale (IRLS)
Type of questionnaire-description,age Subjective scale to measure disease severity of restless legs syndrome in the past week
Number of items 10 questions
Number of domains / categories/subscales 2 subscales; symptoms or symptoms impact subscales
Name of categories/domains Subjective assessment of primary features of restless legs syndrome, intensity and frequency, associated sleep problems
Scaling of items 5 scale (No RLS Score=0 to Very severe RLS Score=4) with total score out of 40
Access with permission or free International RLS Study Group free for academic research and with fee for “for profit” organizations
Scoring test-retest reliability Yes
Scoring Internal consistency Yes (alpha=0.76)
Validity Yes, construct validity; concurrent validity with Restless Legs Syndrome Quality of Life questionnaire (RLSQoL) and overall life impact score
Language English
Translations in other languages (if yes, then list the languages)

Yes - MAPI Research Trust for updates

Afrikaans , Arabic, Cebuano, Czech, Danish, Dutch, Farsi, Finnish, French, German, Greek, Hindi, Hungarian, Italian, Japanese, Korean, Mandarin, Norwegian, Polish, Portuguese, Russian, Serbian, Slovak, Spanish, Swedish, Tagalog, Turkish
Developer name International RLS Study Group
Developer contact information MAPI Research Trust
Availability of questionnaire: needs permission from developer, cost or freely available Use with permission from MAPI Research Trust, free for academic research studies not connected to a for profit study
Limitations Does not examine all aspects of RLS, does not examine number of involved limbs or the rapidity with which symptoms develop when a patietn first sits or lies down
Other comments IRLS scores differed significantly between different levels of sleep problems and Clinical Global Impression (CGI) of health status providing evidence of responsiveness.
Link to the questionnaire (if available) Click Here to View the Questionaire
MAPI Research Trust. France: IRLS contact information and permission to use; c2004-11. [cited on 2011 Mar 13].
References (original publication) Walters AS, LeBrocq C, Dhar A, Hening W, Rosen R, Allen RP, Trenkwalder C. Validation of the International Restless Legs Syndrome Study Group rating scale for restless legs syndrome. The International Restless Legs Syndrome Study Group. Sleep Med. 2003 Mar;4(2):121-32.
Updated by  Vidya Krishnan
The last date of update 2015