Table 4a. Imaging-only grade × combined grade cross-tabulation (κ=0.459, fair agreement).

	Combined grade				Total
	No DR	Mild NPDR	Mod–severe NPDR	Prolif DR
Imaging-only grade
No DR	111	105	6	1	223
Mild NPDR	69	575	144	4	792
Mod–severe NPDR	15	264	465	26	770
Prolif DR	1	14	45	118	178
Total	196	958	660	149	1963