Quantification of Microvascular Density of the Optic Nerve Head in Diabetic Retinopathy Using Optical Coherence Tomographic Angiography

Table 3

Correlation coefficients for DR severity and association of variables with RPC density in OCTA.

	RPC density
	Whole image	Inside optic disc	Peripapillary
DR severity
R value^a	−0.536	−0.269	−0.541
value	<0.01	<0.01	<0.01
Age
R value^b	−0.132	−0.237	−0.142
value	0.027	<0.01	0.017
DM duration
R value^c	−0.191	−0.024	−0.209
value	<0.01	0.734	<0.01
HbA1c
R value^c	−0.188	−0.141	−0.146
value	0.01	0.045	0.037
BCVA
R value^c	−0.053	−0.031	−0.042
value	0.447	0.662	0.547

a, Spearman coefficient R value; b, Pearson coefficient R value; c, partial correlation coefficient R value; RPC, radial peripapillary capillary; DR, diabetic retinopathy; DM, diabetes mellitus; HbA1c, hemoglobin A1c; BCVA, best-corrected vision acuity.