Table 2.

Interobserver Agreement (Percent and Kappa Statistic) on Category of Photoreceptor Loss

		Observer 2
		Inside	Outside	Bridging	Total
Observer 1	Inside	42	1	21	64
	Outside	4	1	2	7
	Bridging	51	2	75	128
	Total	97	4	98	199

Total Pairs	Total Agreement	Percent Agreement
199	118	59.3

Statistic	Value	Standard Error	95% Confidence Limits	95% Confidence Limits
Kappa	0.2258	0.0616	0.1051	0.3466

Photoreceptor (PR) loss categories were inside, outside, or bridging across the geographic atrophy (GA) margin.