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Table 7 Responsiveness of QDIS-7 and generic measures in comparisons across groups differing in self-evaluated outcomes during 9-month follow-up, all diseases combined

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

Measure

Mean change score by self-evaluated outcomea

F-ratio

RVb

95 % CIc

Much better

Somewhat better

Same

Somewhat worse

Much worse

 

(N = 244)

(N = 245)

(N = 1181)

(N = 282)

(N = 37)

   

QDIS-7d

−2.76

−0.04

1.29

3.20

5.87

29.80

1.00

-

SF-8 PCSd

1.36

−0.71

−0.28

−3.22

−4.98

14.15

0.47

(0.24,0.85)

SF-8 MCSd

1.33

−0.47

0.14

−0.33

−0.91

2.06

0.07

(0.00,0.15)

  1. aSelf-evaluated change groups were defined as much better, somewhat better, about the same, somewhat worse, or much worse now in response to the question: “Compared to nine months ago, how much better or worse is your < DISEASE > now?”, where DISEASE was the pre-ID condition
  2. bRelative validity (RV) is computed as the ratio of the comparator F-statistic over the largest F-statistic for that comparison
  3. cComparator confidence intervals (CI) estimated using bootstrap
  4. dNorm-based scoring of all measures based on US general population norms (mean = 50, SD = 10). QDIS-7 scored so a higher score equals worse health; SF-8 scored so a higher score equals better health