Table 3.

False negatives of geographic atrophy detection categorized by the geographic atrophy area within grid.

Area category	Whole test set	False negatives
Questionable	275	173	62.9%
Definite, area < circle I-2	38	30	78.9%
Area ≥ I-2 but < O-2	125	76	60.8%
Area ≥ O-2 but < ½ DA	192	90	46.9%
Area ≥ ½ DA but <1 DA	297	79	26.6%
Area ≥ 1 DA but < 2 DA	403	95	23.6%
Area ≥ 2 DA	1,255	248	19.8%