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Distribution of participants according to CSF levels of Aβ1–42 and amyloid ratio within diagnostic categories. CN, cognitively normal; AD, Alzheimer’s disease; DLB, dementia with Lewy bodies; FTLD, frontotemporal lobar degeneration-related syndrome. Dashed lines indicate 95% quantile values (Q95%) for Aβ1–42 and Aβ1–42/Aβ1–40 in a middle-aged cognitively normal population as described in the “Material and methods” section
