Table 2

Interobserver variability statistics for right eyes

Stereoscopic interobserver measuresMonoscopic interobserver measures
Mean difference between measuresSD of differencet test p valueRange of CDR95% TC (% of range)ICC>0.2 CDR differenceMean difference between measuresSD of differencet test p valueRange of CDR95% TC (% of range)ICC>0.2 CDR difference
H-CDR0.0100.0620.1160.41300.7300.0440.0740.0000.46320.501 [1%]
V-CDR−0.0030.0610.3110.47250.841 [1%]0.0330.0770.0000.5300.713 [3%]
A-CDR0.0040.0720.6280.55260.84NA0.0570.0920.0000.57320.63NA
P-CDR0.0030.0510.5970.39260.84NA0.0340.0660.0000.42310.64NA
  • 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.