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

Table 2

Comparisons of measurements at the foveal avascular zone in the four study groups.

	Control	No DR	Mild DR	Severe DR	F/H value	value
FAZ area, mm^2, mean ± SD	0.28 ± 0.08	0.33 ± 0.08	0.33 ± 0.15	0.35 ± 0.13	5.135	0.162^a
FAZ, perimeter, mm, mean ± SD	2.10 ± 0.32	2.34 ± 0.32	2.33 ± 0.58	2.52 ± 0.54	11.277	0.010^b
AI, mean ± SD	1.13 ± 0.03	1.16 ± 0.05	1.18 ± 0.07	1.22 ± 0.10	26.794	<0.001^c

^aMultiple comparisons are tested using the Kruskal–Wallis test; ^bmultiple comparisons are tested using the Kruskal–Wallis test, severe DR > control (, after Bonferroni correction); ^cmultiple comparisons are tested using the Kruskal–Wallis test, mild DR > control (, after Bonferroni correction) and severe DR > control (, after Bonferroni correction).