TABLE 1.

Number and prevalence of adjudicated cognitive syndrome by assigned etiology among American Indian participants of the Strong Heart Study (2017–2019).

	MCI	Dementia	IN‐MCI
	N = 140	N = 41	N = 35
	35.3%	10.3%	8.8%
Primary consensus etiology
AD	57 (41%)	18 (44%)	0
VBI	71 (51%)	18 (44%)	0
TBI	2 (1%)	1 (2%)	12 (34%)
Other (e.g., LBD)	10 (6%)	4 (10%)	21 (60%)
Unable to determine	0	0	2 (6%)
Mixed consensus etiology
AD primary (sole)	44 (31%)	10 (24%)	0
VBI primary (sole)	53 (38%)	9 (22%)	0
TBI primary (sole)	1 (0.7%)	1 (2%)	9 (26%)
AD & VBI (mixed)	19 (14%)	15 (37%)	0
TBI & any other etiology (mixed)	12 (9%)	1 (2%)	4 (11%)
Other etiologies (mixed)	1 (0.7%)	1 (2%)	0

Note: Values provided as n (column %) unless otherwise indicated. Cognitive intact N = 181 (45.7%).

Abbreviations: AD, Alzheimer's disease; IN‐MCI, impaired cognition not MCI; LBD Lewy body disease; MCI, mild cognitive impairment; TBI, traumatic brain injury; VBI, vascular brain injury.