Table 3.

Location, extent and thickness at the centre point of cystoid spaces

Location and extent
	VRC
UW-FPRC	0	1	2	Total
0	65	0	0	73%
1	2	3	0	5%
2	6	2	22	30%
Total	73%	5%	12%	100%
0—Absent			κ	0.78
1—Definite, outside central 1 mm			SE	0.07
2—Definite, central 1 mm involved			95% CI	0.53 to 0.82

Thickness at the centre point
	VRC
UW-FPRC	0	1	2	3	Total
0	83	2	1	0	86%
1	0	7	3	0	10%
2	0	0	2	1	3%
3	0	0	0	1	1%
Total	83%	9%	6%	2%	100%
0—Not applicable			κ	0.75
1—Small, <200 μm				SE	0.09
2—Medium, ≤400 μm				95% CI	0.56 to 0.93
3—Large, >400 μm

Values in bold indicate consistent gradings. UW-FPRC, University of Wisconsin-Madison Reading Center; VRC, Vienna Reading Center.