Table 1.
Multiple Regression of Macular Pigment Optical Density on Age, Sex, Iris Color, Central Foveal Retinal Thickness, Serum Lutein, and Serum Zeaxanthin in Patients with Retinitis Pigmentosa
| Characteristic | Estimate | SE | P |
|---|---|---|---|
| Age, y | −0.0022 | 0.0014 | 0.13 |
| Sex (male–female) | 0.0398 | 0.0302 | 0.19 |
| Iris color (brown–not brown) | 0.0811 | 0.0326 | 0.0138 |
| Central foveal retinal thickness, μm* | — | — | <0.0001 |
| Serum lutein, loge μg/dL | 0.1510 | 0.0474 | 0.0017 |
| Serum zeaxanthin, loge μg/dL | −0.0716 | 0.0523 | 0.17 |
*
Spline function with three knots.