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Table 2 The distribution of geometrical measurements in the diabetic subgroups

From: The association between retinal vascular geometry changes and diabetic retinopathy and their role in prediction of progression – an exploratory study

Overall data

Retinal parameter

No retinopathy group

Mild NPDR group

Severe NPDR group

PDR group

p value

Mean ± (STD)

(242 bifurcations)

(310 bifurcations)

(372 bifurcations)

(594 bifurcations)

Parent Vessel Diameter d 0 (pixels)

6.97 ± (1.61)*

8.39 ± (2.37) †

8.56 ± (2.39)†

8.98 ± (2.63)‡

0.000

Large Child Diameter d 1 (pixels)

6.17 ± (1.56)*

7.44 ± (2.30)†

7.56 ± (2.34)†

8.01 ± (2.52)‡

0.000

Smaller Child Diameter d 2 (pixels)

4.66 ± (1.04)*

5.47 ± (1.53)†

5.51 ± (1.44)†

5.76 ± (1.70)‡

0.000

Bifurcating Angle θ (Degrees)

77.04 ± (15.6)*

79.85 ± (17.4)*†

80.02 ± (17.8)†

83.23 ± (18.9)‡

0.000

Branching Angle θ 1 (Degrees)

25.14 ± (14.1)

25.12 ± (15.8)

25.82 ± (15.2)

25.05 ± (16.7)

0.941

Branching Angle θ 2 (Degrees)

51.97 ± (19.3)*

55.01 ± (21.2)*

54.84 ± (21.7)*†

58.57 ± (23.7)†

0.027

Junction Exponent χ

3.33 ± (3.24)*†

3.34 ± (3.17)*†

3.30 ± (3.13)†

3.55 ± (3.32)*

0.050

  1. The p-value of ANOVA test is shown with the significant differences between the subgroups as determined by the FLSD test. (Means that do not share a symbol are significantly different).