Reclassification tables of different methods of cerebrospinal fluid interpretation among patients with Alzheimer’s disease and non-Alzheimer’s disease patients. Method 1 (reference): cerebrospinal fluid (CSF) phosphorylated tau (p-tau181) and CSF amyloid-β42 (Aβ42). Method 2: CSF p-tau181 and Aβ 42/40 ratio. Method 3: First measure p-tau181 and CSF Aβ 42, then use Aβ 42/40 ratio instead of Aβ42 in case of discrepancy. Cells in green indicate an improvement compared with method 1, and cells in red indicate a worsening.