Table 4 Correlation of retinal arteriolar and venular parameters with capillary parameters, across all diabetic retinopathy severity levels.

From: Global Assessment of Retinal Arteriolar, Venular and Capillary Microcirculations Using Fundus Photographs and Optical Coherence Tomography Angiography in Diabetic Retinopathy

Capillary (OCT-A) parameters

Arteriolar and venular (SIVA) parameters

Spearman’s correlation coefficient r

p-value

SVP CDI

CRAE

0.150

0.332

CRVE

0.037

0.813

AVR

0.055

0.724

DVP CDI

CRAE

0.064

0.678

CRVE

0.158

0.305

AVR

−0.167

0.279

SVP FDc

FDt

0.033

0.826

FDa

0.082

0.590

FDv

0.008

0.958

DVP FDc

FDt

0.366

0.012

FDa

0.411

0.005

FDv

0.267

0.073

  1. Abbreviations: OCT-A = optical coherence tomography angiography; SIVA = Singapore I Vessel Assessment; SVP = superficial vascular plexus; CDI = capillary density index; DVP = deep vascular plexus; FDc = capillary fractal dimension; CRAE = central retinal arteriolar equivalent; CRVE = central retinal venular equivalent; AVR = arteriole-venule ratio; FDt = total fractal dimension; FDa = arteriole fractal dimension; FDv = venule fractal dimension.
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