Table 3

Retrobulbar circulatory parameters of patients with and without diabetic retinopathy progression during their first and last colour Doppler imaging measurement

		DR non-progression			DR progression
(cm/s)		1st measurement	Last measurement	p Value	1st measurement	Last measurement	p Value
CRA = central retinal artery; CRV = central retinal vein; PCA = posterior ciliary artery; PSV = peak systolic velocity; EDV = end diastolic velocity; MV = mean velocity; *statistically significant difference.
CRA	PSV	7.2 (4.2∼9.6)	7.2 (4.4∼10.3)	0.29	6.7 (3.9∼9.8)	7.0 (4.4∼10.3)	0.62
	EDV	1.9 (0.7∼2.6)	1.8 (0.9∼3.1)	0.99	1.8 (0.9∼3.2)	1.9 (0.9∼2.6)	0.77
	RI	0.75 (0.60∼0.89)	0.74 (0.66∼0.88)	0.61	0.72 (0.53∼0.82)	0.73 (0.55∼0.79)	0.95

CRV	PSV	5.1 (2.6∼9.6)	5.5 (3.0∼12.3)	0.28	4.6 (3.2∼7.0)	5.6 (3.5∼9.1)	0.003*
	EDV	3.0 (1.8∼4.0)	3.2 (1.9∼4.7)	0.51	3.0 (2.3∼3.7)	3.4 (2.3∼4.4)	0.04*
	RI	0.38 (0.23∼0.58)	0.42 (0.28∼0.70)	0.50	0.40 (0.17∼0.52)	0.43 (0.20∼0.56)	0.02*

PCA	PSV	8.6 (4.9∼17.2)	7.9 (4.7∼19.4)	0.73	7.9 (5.4∼15.5)	7.9 (4.0∼14.5)	0.65
	EDV	2.5 (1.8∼5.6)	2.1 (1.9∼4.4)	0.57	2.3 (0.7∼4.4)	2.3 (1.8∼4.2)	0.89
	RI	0.70 (0.56∼0.82)	0.68 (0.56∼0.89)	0.69	0.70 (0.48∼0.91)	0.71 (0.50∼0.86)	0.88