Fig. 1

Transformed baseline CSF β2M in participants classified according to the NIA-AA criteria (A, B, C, D) and age (E). Levels of transformed CSF β2M were significantly lower in S1, T-, N- and mid-life group. Notes: CSF β2M fitted the normal distribution after log10 transformation and then standardized by z-scale. Transformed plasma β2M was computed with the One-way ANCOVA for comparison of means while Fisher's LSD was employed for post hoc test. Models included age, gender, education, APOE ε4 status as covariates. Significant effects (P < 0.05) are shown in bold. Abbreviations: CSF, cerebrospinal fluid; β2M, β2-microglobulin; NIA-AA, National Institute on Aging- Alzheimer’s Association; S, stage; A, amyloidosis; T, tau pathology; N, neurodegeneration; SNAP, suspected non-Alzheimer’s pathophysiology; APOE, Apolipoprotein E