Table 1:

AREDS Severity Scale scores 1 to 9, defined by graders from four categories: geographic atrophy (0/1, i.e., absent/present), increased pigment (0/1, i.e., absent/present), depigmentation (graded 0-3), and drusen area (graded 0-5). The final AREDS Severity Scale score (steps 1-9, shown shaded in different colors) is defined by the combination of findings from these four categories.