GFAP and dementia: In addition, NfL and GFAP showed robust correlations in the whole sample (R = 0.22, (CI: 0.16–0.28), p < 0.0001) but also specifically in the CU (R = 0.23, (CI: 0.16–0.30), p < 0.0001) and dementia (R = 0.10, (CI: −0.25–0.43), p = 0.5) groups.