Table 2.
Retinal Location | Slope (letters/100 µm)* | P-value† |
---|---|---|
Foveal Center | −1.6 ± 0.8 | 0.038 |
Outer Ring (3 mm ID - 6 mm OD) | −7.7 ± 2.6 | 0.004 |
Estimates of mean slope ± standard error by PROC MIXED of SAS based on data from 89 cases (139 eyes).
The two-tailed significance level with respect to zero slope controlling for the relationship of visual acuity to retinal thickness at the other location. The regression line is y = 67.9 − 0.016 x1 − 0.077 x2, where y is ETDRS acuity (letters), x1 is central foveal thickness (µm), and x2 is mean outer ring retinal thickness (µm); the overall model has a p-value = 0.0004.