A diagnosis of RLS was assigned if a participant responded positively to all 4 questions based on the IRLSSG criteria published in 2003: (1) ‘Do you have unpleasant sensations such as crawling or pain in your legs combined with an urge or need to move your legs?’ (2) ‘Do these feelings/symptoms occur mainly or only at rest?’ (3) ‘Does movement improve these unpleasant sensations?’ (4) ‘Are these symptoms worse in the evening or at night than in the morning?’ [14].