TABLE 5.

Comparison of Intraclass Correlation Coefficients and κ Among Observers of Stereoscopic Optic Nerve Head Photographs in Various Studies

Study	No. Graders	HCDR	VCDR
Current study (2004)	3	0.84*	0.85*
Tielsch et al2	2	0.71†	0.74†
Zangwilll et al	3	0.38†	0.65†
Hatch et al11	3	0.74*	0.83*
Correnti et al12	2	0.67*	0.66*

^*Intraclass correlation coefficients.

^†κ.

HCDR indicates horizontal cup-to-disc ratio; VCDR, vertical cup-to-disc ratio.