Levels of sAPPβ, YKL–40 and the sAPPβ:YKL–40 ratio in cearbrospinal fluid across pathological diagnostic groups. Only statistically significant differences are displayed (analysis of covariance and post-hoc Tukey’s honest significant differences). All results were adjusted for age and sex, and correction for multiple comparisons was applied. AD, Alzheimer’s disease; FTLD-Tau, frontotemporal lobar degeneration-Tau; FTLD-TDP, frontotemporal lobar degeneration-TDP, sAPPβ, soluble β fragment of amyloid precursor protein.