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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Invest Ophthalmol Vis Sci. 2008 Jun 14;49(10):4568–4572. doi: 10.1167/iovs.08-1992

Table 2.

Multiple Regression of ETDRS Visual Acuity on Retinal Thickness in Patients with Retinitis Pigmentosa and Macular Cysts

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.