Fig. 3From: Fully automated and highly specific plasma β-amyloid immunoassays predict β-amyloid status defined by amyloid positron emission tomography with high accuracyCorrelation between plasma Aβ42/Aβ40 ratio and Centiloid unit. The Spearman rank correlation coefficient (rS) was calculated to assess the correlation in A discovery (n = 180) and B validation (n = 191) studies. Gray dashed line indicates the cutoff value for the Centiloid unit and the plasma Aβ42/Aβ40 ratioBack to article page