Aß1-42 Tau pTau Conc. CV % Quota % Conc. CV % Quota % Conc. CV % Quota % 242 13,7 69 >220 11,7 87 37-53 11 90-95 >500 12 73-88 460 13,6 85 66-68 9,6 89-97 >800 13 75-92 920 13,3 86 74 10,7 97 CV % refers to the mean of the groups after elimination of the outliers. Success quotas are the fraction of values from all participants which are in the success interval [median ± 25%].

Table 2: Summary of the inter-laboratory variation and success quota for the different concentration ranges [pg/mL] in the samples of the N= 6 surveys between 2011 and 2013

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