GFAP and dementia: As expected, logistic regression analyses showed that both NEFL (Beta = 0.78, 95% CI: 0.69 – 0.86, P = 5.4e-70) and GFAP (Beta = 0.89, 95% CI: 0.80 – 0.98, P = 7.2e-85) levels were associated with incident all-cause dementia, adjusting for age, sex, education, and 10 genetic principal components (PCs).