Table 5 Comparison of vascular density, perfusion density, and foveal avascular zone metrics between two consecutive macular angiography scans (n = 25).

From: Factors Affecting Repeatability of Assessment of the Retinal Microvasculature Using Optical Coherence Tomography Angiography in Healthy Subjects

 

First measurement

(signal strength = 8)

Second measurement

(signal strength = 9)

p-value

VD

6-mm (entire area; mean ± SD, mm−1)

15.33 ± 1.93

16.70 ± 1.33

<0.001

1-mm (center; mean ± SD, mm−1)

6.70 ± 3.25

8.11 ± 2.96

0.001

PD

6-mm (entire area; mean ± SD)

0.37 ± 0.05

0.40 ± 0.04

<0.001

1-mm (center; mean ± SD)

0.14 ± 0.08

0.18 ± 0.07

0.002

FAZ

Entire area (mean ± SD, mm2)

0.18 ± 0.09

0.22 ± 0.10

0.043

Perimeter (mean ± SD, mm)

1.79 ± 0.43

1.84 ± 0.46

0.833

Circularity (mean ± SD)

0.68 ± 0.09

0.74 ± 0.08

0.013

  1. VD = vessel density; PD = perfusion density; FAZ = foveal avascular zone; SD = standard deviation.
  2. The p-value was obtained using a Wilcoxon signed rank test.
  3. Boldface numbers indicate statistically significant differences at p < 0.05.
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