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 | Â | Â | Â | Â |
 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 | Â | Â | Â | Â |
 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 | Â | Â | Â | Â |
 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 |  |