Fig. 1

Biomarker correlation between plasma and CSF. The plots show Pearson’s correlation coefficient of biomarkers between plasma and CSF. The ordinate axis corresponds to CSF values and the abscissa axis to plasma values (all, except the amyloid ratio, expressed in pg/ml). The dots represent a pair of values of both variables for each observation. The green ones are those corresponding to amyloid-negative subjects, and the blue ones represent the amyloid-positive subjects. The black line is the regression line. In the upper left corner of each graph is the correlation coefficient (r). Abbreviations: CSF, cerebrospinal fluid; AB, amyloid β; P-tau, phosphorylated tau