GFAP and Alzheimer disease: To account for potential influences of age, BMI, and education, ranked linear models were used as an alternative to the Kruskal-Wallis test, with all plasma biomarkers (Aβ42, Aβ42/40 ratio, GFAP, NfL, p-tau181, p-tau217) and disease-related regional MRI volumes (AD-, FTD-, CTE ROIs) as outcomes.