Fig. 3From: Core Alzheimer’s disease cerebrospinal fluid biomarker assays are not affected by aspiration or gravity drip extraction methodsa–i Box and whisker plots of median biomarker levels between extraction method and clinical classification. Black boxes and points represent data from samples extracted using the aspiration method. Grey boxes and points represent data from samples extracted using the gravity drip method. Upper lines on each box represent the 3rd quartile, middle lines represent the median value, and the lower lines represent the first 1st quartileBack to article page