Fig. 3From: Impact of frequent cerebrospinal fluid sampling on Aβ levels: systematic approach to elucidate influencing factorsIndividual CSF Aβ1–40 profiles for all participants per cohort. a Cohort 1: immediate sampling, high frequency. b Cohort 2: delayed sampling, high frequency, procedure effect. c Cohort 3: ibuprofen, high frequency, inflammation effect. d Cohort 4: immediate sampling, low frequency. APOE ε4 carriers are indicated in red with a square or diamond symbol. Cohort 1: only five participants are shown; one participant (participant 6) did not have a baseline sample available. Aβ amyloid beta (Color figure online)Back to article page