MAPT and dementia: The CSF markers for dementia, total tau protein and phosphor-tau were within the normal range, while beta-amyloid 1-42 and the Innotest-amyloid-tau index (IATI) were found to be below the reference values (beta-amyloid 1-42: 290 pg/ml, reference value > 500 pg/ml; IATI 0.6, reference values > 1).