Fig. 4From: Interlaboratory proficiency processing scheme in CSF aliquoting: implementation and assessment based on biomarkers of Alzheimer’s diseaseCorrelation of variability between Aβ1–42 concentrations measured in two aliquots prepared by a given laboratory and duration of preparation of these aliquots. Variability expressed as absolute difference between concentrations in the two aliquots prepared by a given laboratory divided by average of these two concentrations. Aβ amyloid betaBack to article page