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Table 4 Concurrent validity: correlations between the RLSQoL overall life impact score and the scores for the IRLS total score and the MOS Sleep Problems Index II (TREAT RLS 1 and 2)a

From: The reliability, validity and responsiveness of the Restless Legs Syndrome Quality of Life questionnaire (RLSQoL) in a trial population

RLSQoL overall life impact score   IRLS total score MOS Sleep Scale Sleep Problems Index II
TREAT RLS 1 Spearman correlation coefficient -0.68 -0.59
  p value < 0.0001 < 0.0001
  Number of patients 284 284
TREAT RLS 2 Spearman correlation coefficient -0.67 -0.60
  p value < 0.0001 < 0.0001
  Number of patients 263 263
  1. IRLS = International Restless Legs Scale. RLSQoL = Restless Legs Syndrome Quality of Life questionnaire. MOS = Medical Outcomes Study.
  2. a Satisfactory if correlation ≥ 0.40.