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Table 3 Construct validity and reliability of the RLSQoL overall life impact score

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

  TREAT RLS 1 TREAT RLS 2
Item-convergent validity, % items with item-scale correlation ≥ 0.40 (coefficient range) 85% (0.35–0.66) 100% (0.46–0.70)
Floor/ceiling effects (% of respondents with minimum/maximum scale scores) 0.35%/0.00% 0.00%/0.38%
Internal consistency reliability, Cronbach's alpha coefficient (satisfactory if ≥ 0.70) 0.82 0.87
  1. RLSQoL = Restless Legs Syndrome Quality of Life questionnaire.