Table 3.

Retinal oxygen saturation and vessel width subgroups of patients

	Subgroups
	Possible Alzheimer's disease according to biomarkers (n = 16)	MCI without biomarkers of Alzheimer's disease (n = 25)
Oxygen saturation (%)
Arterioles	93.2 ± 5.0	93.0 ± 2.7
Venules	58.6 ± 7.8	60.2 ± 5.0∗
AV difference	34.6 ± 5.0	32.8 ± 4.1†
Vessel width (pixels)
Arterioles	12.0 ± 1.0	12.0 ± 1.0
Venules	15.1 ± 1.1	15.0 ± 1.2

Abbreviation: AV, arteriovenous; MCI, mild cognitive impairment.

NOTE. *P = .005; †P = .01 when compared to paired, healthy cohort.