Construct validity of cognitive intraindividual variability: A replication study

We previously found intraindividual variability (IIV) in performance between cognitive domains to predict subsequent declines in cognitive and functional status over a 5‐year period in the Texas Alzheimer’s Research and Care Consortium (TARCC) Hispanic Longitudinal Cohort. However, we later examined the construct validity and predictive utility of this metric in a follow‐up study and found that IIV‐between domains was driven primarily by IIV‐within the executive function domain in the non‐Hispanic cohort and by IIV‐within the language domain in the Hispanic cohort. The present study aimed to replicate these findings in two independent samples: (1) FRONTIER, and (2) HABLE.