TABLE 2.

Demographic variable Pearson correlations, Kruskal–Wallis tests, and point biserial correlations with cognitive skills, functional ability, and plasma AD biomarkers, n = 260.

	mCRT	VMI	Block design	Vineland‐3 ABC	Plasma Aβ42/40	Plasma total tau	Plasma NfL
Chronological age	−0.46 **	−0.30 **	−0.22 **	−0.28 **	−0.11	0.12	0.64 **
Lifetime ID level a	18.56 **	43.67 **	49.27 **	62.22 **	2.19	5.82	0.83
Biological sex b	0.14 *	−0.01	−0.06	0.05	0.05	0.13 *	−0.01

Abbreviations: ABC, Adaptive Behavior Composite; Aβ, amyloid beta; AD, Alzheimer's disease; ID, intellectual disability; mCRT, modified Cued Recall Test; NfL, neurofilament light chain; VMI, visual motor integration.

^* P < 0.05.

^** P < 0.01.

^a Kruskal–Wallis test used due to categorical variable.

^b Point biserial correlations used due to dichotomous variable.