Overall | iAMD | No AMD | Early AMD | Late AMD | ||
n=289 | n=167 | n=53 | n=28 | n=41 | ||
VILL reading and accessing information | ICC (95% CI) | 0.920 (0.900 to 0.936) | 0.868 (0.825 to 0.901) | 0.736 (0.584 to 0.838) | 0.958 (0.912 to 0.980) | 0.878 (0.783 to 0.933) |
CoR | 1.9 | 1.7 | 2.4 | 0.5 | 2.2 | |
Deming intercept (95% CI) | −0.14 (−0.29 to 0.01) | −0.18 (−0.37 to 0.01) | −0.23 (−0.82 to 0.37) | −0.25 (−0.57 to 0.07) | −0.22 (−0.65 to 0.21) | |
Deming slope (95% CI) | 0.93 (0.87 to 0.98)* | 0.93 (0.85 to 1.01) | 0.97 (0.77 to 1.18) | 0.95 (0.89 to 1.02) | 0.87 (0.68 to 1.06) | |
VILL mobility and safety | ICC (95% CI) | 0.929 (0.911 to 0.943) | 0.904 (0.872 to 0.928) | 0.800 (0.677 to 0.879) | 0.974 (0.944 to 0.988) | 0.932 (0.876 to 0.963) |
CoR | 1.8 | 1.7 | 2.4 | 0.9 | 1.7 | |
Deming intercept (95% CI) | 0.04 (−0.08 to 0.17) | −0.10 (−0.31 to 0.11) | 0.07 (−0.52 to 0.66) | 0.19 (−0.15 to 0.53) | 0.05 (−0.21 to 0.30) | |
Deming slope (95% CI) | 0.94 (0.89 to 0.99)* | 0.97 (0.88 to 1.06) | 0.99 (0.75 to 1.23) | 0.90 (0.82 to 0.97)* | 0.88 (0.78 to 0.97)* | |
VILL emotional well-being | ICC (95% CI) | 0.822 (0.78 to 0.856) | 0.791 (0.727 to 0.842) | 0.632 (0.44 to 0.77) | 0.895 (0.788 to 0.95) | 0.769 (0.608 to 0.869) |
CoR | 5.0 | 4.5 | 4.4 | 3.6 | 6.3 | |
Deming intercept (95% CI) | 0.06 (−0.19 to 0.31) | 0.14 (−0.20 to 0.47) | −1.47 (−3.78 to 0.83) | 0.03 (−0.47 to 0.52) | 0.27 (−0.52 to 1.06) | |
Deming slope (95% CI) | 0.71 (0.67 to 0.75)* | 0.69 (0.63 to 0.75)* | 0.95 (0.60 to 1.30) | 0.75 (0.68 to 0.81)* | 0.70 (0.60 to 0.80)* |
*CIs excluding the expected intercept 0 (systematic difference between the two measurements) or the expected slope 1 (disproportionate slope) were marked.
AMD, age-related macular degeneration; CoR, coefficient of repeatability; iAMD, intermediate age-related macular degeneration; ICC, intraclass correlation coefficient; VILL-33, Vision Impairment in Low Luminance with 33 Items; VILL, Vision Impairment in Low Luminance.