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Br J Ophthalmol 84:403-407 doi:10.1136/bjo.84.4.403
  • Original Article
    • Clinical science

A new digital optic disc stereo camera: intraobserver and interobserver repeatability of optic disc measurements

Table 2

Intraobserver and interobserver variability statistics

Intraobserver Interobserver
Mean difference between measures SD of difference Range of CDR 95% TC
(% of range) 		ICC CV ⩾0.2 CDR difference Mean difference between measures SD of difference Range of CDR 95% TC (% of range) ICC CV ⩾0.2 CDR difference
V-CDR 0.009 0.069 0.08–0.95 15.6% 0.919 11.7% 2% -0.018 0.072 0.12–1.00 15.9% 0.898 11.8% 3%
H-CDR 0.000 0.056 0.2–
0.92 		15.3% 0.941 9.5% 0% 0.002 0.071 0.18–0.91 19.2% 0.889 12.1% 2%
A-CDR 0.001 0.053 0.06–0.84 13.4% 0.955 14.2% NA -0.01 0.068 0.06–0.89 16.2% 0.921 17.9% NA
P-CDR 0.002 0.047 0.27–0.94 13.6% 0.946 7.6% NA -0.007 0.06 0.27–0.95 17.2% 0.904 9.7% 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; CV = coefficient of variation.

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