Table 1.
Mean Values of Manually Extracted Parameters
| Nonreferable DR (± SD) | Referable DR (± SD) | P Value | |
|---|---|---|---|
| FAZ parameters | |||
| Area (mm2) | 1.340 (0.825) | 1.915 (1.204) | < 0.01 |
| Perimeter (mm) | 7.591 (5.070) | 10.199 (5.741) | < 0.01 |
| Acircularity index | 1.835 (0.661) | 2.072 (0.665) | < 0.01 |
| Minimum diameter (mm) | 0.997 (0.242) | 1.088 (0.293) | < 0.01 |
| Maximum diameter (mm) | 1.545 (0.341) | 1.867 (0.534) | < 0.01 |
| Axis ratio | 1.654 (0.822) | 1.762 (0.429) | 0.11 |
| Eccentricity | 0.562 (0.152) | 0.625 (0.147) | < 0.01 |
| Vascular parameters | |||
| Vessel density | 0.449 (0.041) | 0.384 (0.044) | < 0.01 |
| Inner density | 0.463 (0.042) | 0.395 (0.046) | < 0.01 |
| Central density | 0.261 (0.062) | 0.207 (0.065) | < 0.01 |
| Skeleton density | 0.062 (0.007) | 0.051 (0.007) | < 0.01 |
| Fractal dimension | 1.883 (0.014) | 1.861 (0.017) | < 0.01 |