Table 2.

Summary of participant retinal microvascular parameters

Retinal microvascular parameters	All (n = 1431)	No MCI (n = 1275)	MCI (n = 156)	P-Value
Mean CRAE (PX, SD)	29.643 ± 2.221	29.632 ± 2.213	29.731 ± 2.294	0.60
Mean CRVE (PX, SD)	40.844 ± 3.268	40.858 ± 3.293	40.723 ± 3.059	0.62
Mean AVR (SD)	0.729 ± 0.061	0.728 ± 0.061	0.733 ± 0.064	0.38
Mean fractal dimension arteriolar (SD)	1.557 ± 0.053	1.557 ± 0.053	1.555 ± 0.053	0.60
Mean fractal dimension venular (SD)	1.540 ± 0.051	1.540 ± 0.050	1.539 ± 0.052	0.78
aMean tortuosity arteriolar (SD)	0.114 ± 0.157	0.112 ± 0.157	0.128 ± 0.162	0.24
aMean tortuosity venular (SD)	0.067 ± 0.106	0.068 ± 0.111	0.063 ± 0.056	0.61

Values are n (%) for categorical variables and mean ± SD for continuous variables. P values were calculated by independent samples t tests. Abbreviations: MCI mild cognitive impairment, CRAE central retinal arteriolar equivalent, CRVE central retinal venular equivalent, AVR retinal arteriole/venular ratio, SD standard deviation, PX Pixels. ^aTortuosity values were multiplied by 1000 in order to be shown in Table. P < 0.05 was considered statistically significant