Fig. 3From: Diagnostic performance of automated plasma amyloid-β assays combined with pre-analytical immunoprecipitationReceiver operating characteristic (ROC) curves for Elecsys measurements without or with pre-analytical immunoprecipitation (IP). ROC curves for the classification of the study participants into the diagnostic groups Aβ-positive (Aβ+) and Aβ-negative (Aβ−) were calculated for Elecsys measurements in plasma or IP-eluates. 95% confidence intervals were calculated using the DeLong approach and are indicated in brackets. Aβ, amyloid-β; Aβ+, Aβ-positive: CSF Aβ42/40 ≤ 0.050; Aβ−, Aβ-negative: CSF Aβ42/40 > 0.050; IP, immunoprecipitationBack to article page