Table 5.

Time to detect progression according to different scenarios of optical coherence tomography retinal nerve fiber layer thickness loss over time, by race and ethnicity, assuming annual testing.

BY RACE
Baseline disease severity, μm	“True” rates of change, μm/year	Mean time to detect progression, Mean ± SD, years			Difference in time to detect progression in 80% of eyes (80% power), years
		Black or African American	White	P value	Black or African American versus White Subjects
90	−0.5	10.2 ± 5.3	10.0 ± 5.3	0.291	0.2
	−1.0	6.6 ± 2.3	6.4 ± 2.2	0.003	0.3
	−2.0	4.7 ±1.4	4.4 ±1.4	0.000	0.3
70	−0.5	10.0 ± 5.6	9.6 ± 5.7	0.184	0.2
	−1.0	6.4 ± 2.1	5.9 ±1.8	0.000	0.7
	−2.0	4.4 ±1.2	4.1 ±1.2	0.000	0.3
BY ETHNICITY
Baseline disease severity, μm	“True” rates of change, μm/year	Mean time to detect progression, Mean ± SD, years			Difference in time to detect progression in 80% of eyes (80% power), years
		Hispanic or Latino	Not Hispanic or Latino	P value	Hispanic or Latino versus Not Hispanic or Latino
90	−0.5	9.6 ± 5.4	10.6 ± 5.7	0.000	−1.3
	−1.0	6.0 ± 2.0	6.5 ± 2.2	0.000	−0.7
	−2.0	4.4 ±1.2	4.5 ±1.4	0.000	−0.3
70	−0.5	9.4 ± 5.6	9.5 ± 5.3	0.875	0.2
	−1.0	5.9 ± 2.1	5.9 ±1.9	0.768	0.0
	−2.0	4.2 ±1.1	4.2 ±1.2	0.383	0.0

SD = Standard deviation.