Table 2.

Descriptive and inferential statistics for QOL-ACC utility scores, for the full sample and by cognition subgroup

	Full sample (n = 63)	No impairment (n = 22)	Mild-to-moderate impairment (n = 41)	Comparisons across cognition subgroups
Self-report
mean (SD)	0.768 (0.23)	0.786 (0.24)	0.759 (0.23)	Z=-0.49, p = 0.62
median	0.823	0.846	0.822
25th & 75th perc.	0.63, 0.93	0.78, 0.93	0.62, 0.94
Proxy-proxy
mean (SD)	0.666 (0.25)	0.715 (0.26)	0.640 (0.25)	Z=-1.39, p = 0.16
median	0.738	0.761	0.714
25th & 75th perc.	0.50, 0.86	0.54, 0.93	0.47, 0.80
Proxy-person
mean (SD)	0.642 (0.27)	0.679 (0.26)	0.623 (0.28)	Z=-0.82, p = 0.41
median	0.747	0.786	0.691
25th & 75th perc.	0.47, 0.84	0.44, 0.88	0.54, 0.80
Comparisons across raters	Q(2) = 141.79; p < 0.01	Q(2) = 49.95; p < 0.01	Q(2) = 90.73; p < 0.01

p, p value; perc., percentiles; Q(2), Friedman statistic; SD, standard deviation; Z, Z score for Mann-Whitney U test