Midlife Measures of General Cognitive Performance in the National Longitudinal Study of Adolescent to Adult Health (Add Health)

The study presents results of cognitive assessment in 2,525 participants from Add Health Wave VI who completed in-home cognitive performance evaluation. Using confirmatory factor analysis, two general cognitive performance scores were developed: one based on five originally designed cognitive domains and another modified according to the Harmonized Cognitive Assessment Protocol framework. Both models demonstrated good fit with statistical indicators (RMSEA = 0.025-0.027, SRMR = 0.031-0.033, CFI = 0.962-0.968). The Add CAPS cognitive battery captures a robust hierarchical structure of general cognitive performance. The derived factor scores provide a valuable method for characterizing an individual's cognitive baseline in midlife. The modified Add CAPS GCP-H version improves comparability with the HCAP network and supports cognitive aging analyses across different cohorts.