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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