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Table 2 Vascular density in superficial capillary network (SCN) of normal subjects and subtypes of diabetic retinopathy (N = 188)

From: Quantitative assessment of vascular density in diabetic retinopathy subtypes with optical coherence tomography angiography

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
  1. NDR No diabetic retinopathy, NL Normal, NPDR Nonproliferative diabetic retinopathy, PDR Proliferative diabetic retinopathy
  2. * Mann- Whitney test
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