Table 4.

Percentage agreement among graders (A, B and C) assessing progression using one or two images per visit using individual grader criteria (a) and for assessing one set of images from each visit with individual grader criteria and with predefined common TCA progression criteria (b)

(a)
Individual criteria	One image	Two images	Difference
A vs B	59.1	58.2	0.9
A vs C	77.3	75.5	1.8
B vs C	78.2	77.3	0.9

(b)
One image	Individual criteria	Common criteria	Difference
A vs B	59.1	86.4	−27.3
A vs C	77.3	86.4	−9.1
B vs C	78.2	83.6	−5.5

TCA, topographic change analysis.