Observer 1 | Observer 2 | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean difference between measures | SD of difference | t test p value | Range of CDR | 95% TC (% of range) | ICC | >0.2 CDR difference | Mean difference between measures | SD of difference | t test p value | Range of CDR | 95% TC (% of range) | ICC | >0.2 CDR difference | ||
H-CDR | −0.022 | 0.057 | 0.000 | 0.46 | 24 | 0.75 | 1 [1%] | −0.019 | 0.082 | 0.022 | 0.58 | 28 | 0.71 | 3 [3%] | |
V-CDR | −0.018 | 0.060 | 0.002 | 0.59 | 20 | 0.87 | 1 [1%] | −0.015 | 0.064 | 0.014 | 0.57 | 22 | 0.86 | 1 [1%] | |
A-CDR | −0.030 | 0.063 | 0.000 | 0.62 | 20 | 0.85 | NA | −0.022 | 0.081 | 0.006 | 0.68 | 23 | 0.82 | NA | |
P-CDR | −0.021 | 0.051 | 0.000 | 0.48 | 21 | 0.82 | NA | −0.014 | 0.061 | 0.023 | 0.56 | 21 | 0.83 | NA |
TC = tolerance for change; V-CDR = vertical cup-disc ratio; H-CDR = horizontal cup-disc ratio; A-CDR = area cup-disc ratio; P-CDR = perimeter cup-disc ratio; ICC = intraclass correlation coefficient.