Figure 5From: Cerebrospinal fluid biomarkers for Alzheimer disease and subcortical axonal damage in 5,542 clinical samplesA plot of NFL levels in patient groups who fulfill AD biomarker criteria or not, and how they develop with age. Patients with a positive AD biomarker pattern display elevated levels of NFL more often than do patients with a negative AD biomarker pattern, but the gap between the two groups closes with age.Back to article page