Table 2.

Descriptive statistics of the absolute difference between repeated measurements of cup-disc ratio

	Absolute Difference						Absolute Difference ≥ 0.05
Camera, Gradere	N	Mean	SDa	Minb	Maxc	Median	Freqd	Percent
Topcon
Grader 1	422	0.07	0.08	0.00	0.50	0.05	247	58.5
Grader 2	420	0.06	0.07	0.00	0.55	0.05	283	67.4
Pictor
Grader 1	422	0.09	0.12	0.00	0.80	0.05	261	61.9
Grader 2	412	0.06	0.09	0.00	0.70	0.05	250	60.7

^aSD = Standard Deviation

^bMin = Minimum

^cMax = Maximum

^dFreq = Frequency