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

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)

^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

^bRelative validity (RV) is computed as the ratio of the comparator F-statistic over the largest F-statistic for that comparison

^cComparator confidence intervals (CI) estimated using bootstrap

^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