. Author manuscript; available in PMC: 2007 Aug 2.

Published in final edited form as: Ophthalmology. 2003 Aug;110(8):1499–1505. doi: 10.1016/S0161-6420(03)00496-2

Table 3.

Mean Differences (Standard Deviation), 95% Confidence Intervals, 95% Limits of Agreement, and Intraclass Correlation Coefficients in Estimating Cup-to-Disc Ratio among Discam, Heidelberg Retina Tomograph, and Stereoscopic Disc Photography

	Mean Difference (±Standard Deviation)	95% Confidence Interval	95% Limits of Agreement	Intraclass Correlation Coefficient
HRT, ACDR and Discam ACDR	0.11 (0.11)	0.10–0.12	−0.11–0.33	0.49
Stereo photo VCDR and Discam VCDR	0.11 (0.13)	0.09–0.13	−0.15–0.37	0.46
Stereo photo HCDR and Discam HCDR	0.09 (0.13)	0.07–0.11	−0.17–0.35	0.53

ACDR = cup-to-disc area ratio; HCDR = horizontal cup-to-disc ratio; HRT = Heidelberg Retina Tomograph; VCDR = vertical cup-to-disc ratio.