Analysis of Foveal Microvascular Abnormalities in Diabetic Retinopathy Using Optical Coherence Tomography Angiography with Projection Artifact Removal

Table 4

Correlations between OCTA parameters and severity of DR.

	No DR	Mild DR	Severe DR	Correlation coefficient	value
FAZ area, mm^2, mean ± SD	0.33 ± 0.08	0.33 ± 0.15	0.35 ± 0.13	0.017	0.832
FAZ, perimeter, mm, mean ± SD	2.34 ± 0.32	2.33 ± 0.58	2.52 ± 0.54	0.091	0.260
AI, mean ± SD	1.16 ± 0.05	1.18 ± 0.07	1.22 ± 0.10	0.213	0.010
Vessel density
FD-300, %, mean ± SD	48.21 ± 3.93	45.33 ± 4.12	41.87 ± 4.67	−0.384	<0.001
Parafoveal vessel density
SCP, %, mean ± SD	47.56 ± 4.08	42.57 ± 4.94	38.26 ± 5.52	−0.490	<0.001
DCP, %, mean ± SD	50.26 ± 4.54	48.58 ± 4.34	41.86 ± 5.93	−0.441	<0.001