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Table 6 Correlations of QDIS-7 with disease-specific and generic measures, five disease groups

From: Standardizing disease-specific quality of life measures across multiple chronic conditions: development and initial evaluation of the QOL Disease Impact Scale (QDIS®)

Disease N Disease-specific severitya Disease-specific QOLb Generic Physicalc Generic Mentalc
Arthritis 925 0.72 0.71 −0.69 −0.44
CKD 240 0.66 0.83 −0.44 −0.43
Cardiovascular 542 0.65 0.72, 0.79 −0.52 −0.51
Diabetes 695 0.54 0.72, 0.72 −0.43 −0.49
Respiratory 848 0.74 0.83 −0.58 −0.38
  1. QDIS-7 scored so a higher score equals worse health
  2. Abbreviations: CKD chronic kidney disease
  3. aSelf-rating of disease severity (5 categories, None-Very Severe)
  4. bDisease-specific QOL measures are Arthritis: Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC®) Total scale [6]; CKD: Kidney-Disease Quality of Life 36-item instrument (KDQOL-36™) Burden scale [11]; Cardiovascular: Angina/MI-Seattle Angina Questionnaire Quality of Life scale [38] (first entry N = 275) and CHF-Minnesota Living with Heart Failure® Questionnaire total scale [39] (second entry, N = 267); Diabetes: Problem Areas in Diabetes Scale total scale [41] (first entry) and Diabetes Quality of Life measure total scale [40] (second entry); Respiratory: St. George’s Respiratory Questionnaire total scale [7]. All disease-specific measures are scored so a higher score equals worse health
  5. cSF-8 Health Survey physical and mental component summary measures scored so a higher score equals better health