Table 2.

Vascular density in superficial capillary network (SCN) of normal subjects and subtypes of diabetic retinopathy (N = 188)

Groups VD/ Reference group	NL (40 eyes) Median (range) (%)	NDR (39eyes) Median (range) (%)	NPDR (64eyes) Median (range) (%)	PDR (45eyes) Median (range) (%)	P-value Kruskal –Wallis test
Whole image Normal NDR NPDR	54.65 (47.00–50.04)	51.90 (42.40–56.28) < 0.001*	48.05 (35.07–55.78) < 0.001* < 0.001*	45.50 (33.74–50.48) < 0.001* < 0.001* < 0.001*	< 0.001
Fovea Normal NDR NPDR	29.17 (23.94–41.86)	26.26 (20.77–34.20) 0.013*	27.07 (16.11–38.10) 0.033* 0.859*	24.00 (17.68–36.14) < 0.001* 0.045* 0.062*	0.001
Para-fovea Normal NDR NPDR	57.37 (50.09–62.24)	54.54 (42.74–59.47) < 0.001*	49.96 (36.69–57.81) < 0.001* < 0.001*	47.24 (35.77–52.32) < 0.001* < 0.001* < 0.001*	< 0.001
Superior-hemi Normal NDR NPDR	57.25 (48.60–62.67)	54.03 (44.06–59.20) < 0.001*	49.92 (34.64–57.05) < 0.001* < 0.001*	46.67 (33.59–53.64) < 0.001* < 0.001* < 0.001*	< 0.001
Inferior-hemi Normal NDR NPDR	57.39 (49.50–62.60)	54.13 (41.44–59.73) < 0.001*	49.70 (38.70–58.55) < 0.001* < 0.001*	46.82 (38.06–53.41) < 0.001* < 0.001* < 0.001*	< 0.001
Temporal Normal NDR NPDR	55.76 (48.17–60.28)	53.57 (39.58–58.12) 0.001*	48.62 (36.52–57.70) < 0.001* < 0.001*	46.17 (37.79–52.46) < 0.001* < 0.001* < 0.001*	< 0.001
Superior Normal NDR NPDR	58.50 (49.62–63.98)	55.57 (45.22–59.62) < 0.001*	50.58 (36.96–57.50) < 0.001* < 0.001*	46.25 (34.26–53.65) < 0.001* < 0.001* 0.001*	< 0.001
Nasal Normal NDR NPDR	57.13 (49.50–62.64)	53.44 (44.22–58.51) < 0.001*	49.31 (33.37–57.84) < 0.001* 0.001*	46.34 (31.09–52.93) < 0.001* < 0.001* 0.002*	< 0.001
Inferior Normal NDR NPDR	57.87 (48.20–63.75)	55.06 (42.01–61.70) < 0.001*	50.35 (39.90–59.36) < 0.001* < 0.001*	47.34 (38.26–54.97) < 0.001* < 0.001* < 0.001*	0.043

NDR No diabetic retinopathy, NL Normal, NPDR Nonproliferative diabetic retinopathy, PDR Proliferative diabetic retinopathy

* Mann- Whitney test